Harry didn't really feel the need to taunt, but Voldemort had always had a short temper and it was never something he could completely restrain. It tended to make him slightly more reckless which made him slightly more vulnerable. The best way to do that was to taunt him.
Voldemort didn't even acknowledge Harry as he continued to watch the energy pulses from the artifact in front of him. Pulses that seemed to be increasing in power and brightness.
As he came around the rubble, Harry realized that it was a large mirror that he was sending energy into. Harry's eye was distracted by the glowing runes beneath Voldemort that seemed to form a circle of energy around him.
As tempted as he was, he knew better than to just fire a spell hoping to interrupt whatever ritual Voldemort was engaged in. Such an action would likely have explosive repercussions.
He let his gaze travel back over the mirror, with a start. He realized that it looked familiar. It took him a second to realize what he was looking at, and the pulses of light coming from it didn't help. But he managed to glimpse enough of it to realize that it was the Mirror of Erised.
Harry wondered where Voldemort had dug that artifact up from. He hadn't seen that since he was 11, and he stopped Quirrelmort from getting the sorcerer's stone. He remembered the first time he looked in it. It was the first time in his life he had ever seen his parents. At least a memory that he could remember clearly. He remembered Dumbledore's warning about people wasting their lives away in front of it.
Of course despite the danger it posed, Dumbledore in all his infinite wisdom decided it best to leave it in an unguarded and unwarded classroom where any curious first year could stumble across it.
Voldemort finally turned to regard Harry fully, though the pulsing energy from the runic circle and the mirror seemed to continue to grow stronger. Voldemort kept his wand pointed at the mirror and his red eyes gleamed as he stared at Harry, a grin stretching across his face. "I wondered if you'd come to see me off!"
Harry pointed his wand at Voldemort, his voice flat. "I've been trying to see you 'off' for years. You didn't have to do all this just to get my attention."
His eyes fell upon the pale white features in front of him. Voldemort was hairless and to a large extent almost featureless.
To the casual glance Voldemort hadn't changed in almost 10 years since that night in the cemetery, when he "invited" Harry to be part of his rebirth. He flashed back to being tied to a gravestone, and then out of his memory again. He saw Voldemort's red eyes glaring back at him.
Voldemort shook his head. "No boy, I'm leaving this world. Away. Someplace you won't be able to find me"
Harry didn't wait to hear anything else, he flicked his wand slightly, shooting a bone-breaking hex right at Voldemort's head. Voldemort didn't even flinch, as the hex ricocheted off the pulsing energy surrounding him.
This just seemed to amuse Voldemort further, his laughter was louder. "You can't break through, the ring protects me during the ritual."
Harry changed approaches and fired a blasting hex at the runes on the ground and then had to dive out of the way as the hex reflected right back at him. His eyes widened when he realized that the runes in the circle around Voldemort were sketched out of blood. Harry's eyes flicked around instinctively, and fell on a pile of black robed bodies that were piled beside some rubble. Bodies he hadn't noticed earlier and based on the way they were piled, were clearly dead.
Death Eaters. Good riddance.
His mind working furiously as he tried to figure out what Voldemort was up to, he shook his head, "Such a reward for your loyal followers. What's the matter? Did they final realize that you're pathetic? Or did you get tired of the fact that they had a dozen brain cells between the lot of them?"
Voldemort's voice was filled with immense satisfaction. "They gave their lives so that their Lord could leave this realm, and find some place that I may take my rightful place as the ruler of the wizarding world! This is the moment boy. Where I go, you will never be able to find me! Much less follow me!"
Harry's eyes narrowed and snarled, "You're not going anywhere! Except onto that next great adventure!"
Without waiting for a reply, Harry pointed his wand at the ground in front of himself and half growled "Terra Conquasso!" Harry poured a large amount of power through his wand.
Though the tip of his wand glowed slightly, nothing else happened for a moment before the ground in front of him began to shake and rumble. After a few moments the ground itself began to crack and rupture as the spell continued to shake the very earth.
Voldemort frowned in confusion for a moment before his eyes widened in shock and horror, however he was powerless to do anything as a crack in the ground formed and headed right for his runic circle. The crack split the runes holding the circle together causing a giant surge of light blinding them both.
Harry's wand was in the air even as his head was turned away firing another bone breaking hex right at Voldemort, however it fizzled against the shield Voldemort put up with a flick of his own wand. He retaliated quickly with a blasting hex that Harry batted away almost negligently.
Harry changed tacks, and aimed his wand at Voldemort, and then flicked it quickly to send a blasting hex of his own, only to change directions slightly at the last moment to send it directly at the mirror. He didn't know what Voldemort had done, nor did he have the faintest idea of what a ritual like this would do. His logic was simple. This was something Voldemort wanted, so by extension this was something Harry wanted to stop.
However, the blasting hex hit the mirror and the silver surface seemed to ripple from the impact, but didn't do anything to stop the frequencies of the flashes from quickly turning into a strobe effect as the whining sound grew louder. The shaking ground from the spell he cast earlier didn't seem to be slowing, on the contrary it seemed to be increasing the ground rumbling loudly, despite Harry having canceled the spell.
Harry couldn't manage to keep his balance and fell to the ground. Though he didn't manage to stop the follow-up to the first spell Voldemort sent apparently aimed at his face, instead impacted him right in the chest, as he fell. Harry heard and felt several bones snap and it felt like his entire chest caved in. Harry tasted a flood of blood in his mouth even as he cursed himself for his own carelessness.
"Too late Harry Potter! I go now to a place where there is no Boy-Who-Lived!" Voldemort turned away from Harry, and staggered on the shaking ground, he managed to keep his feet though as he lurched forward toward the Mirror.
Harry saw Voldemort's hand reach out and disappear inside the mirror. Rage exploded inside him at the idea that his mortal enemy might escape. "I swear Tom, you will never escape! I will be the end of you!" At least that's what he tried to say, he coughed and gagged out several parts of it.
Harry wasn't even sure Voldemort heard him. If he did, Voldemort certainly didn't acknowledge it as he half stumbled and half fell forward into the mirror, his entire body disappearing into the silvery liquid.
Despite Voldemort's disappearance, the ground continued to shake as Harry lay there; and it seemed to be getting worse. He wasn't sure what was happening, and knew he was in trouble. Whatever curse he took right in the chest had obviously gotten through his dragonhide armor and was doing bad things to his internal organs.
However only one thought entered his mind. Following Voldemort. He crawled forward along the shaking ground. The rumbling around him grew worse and the vibrating sound from the mirror seemed to be getting worse. At one point he felt something ice cold pass over him, and thought it might be the grip of death, but he pressed onward and the feeling quickly passed.
Inch by agonizing inch he crawled forward to the Mirror. It took him what seemed like hours to crawl the handful of yards forward. When he reached the mirror he put his hand forward and his hand slid right into the glass like it was liquid.
With a last groan of effort he heaved himself forward pushing his entire body into the glass of the mirror, aided by a sudden jolt in the ground that threw him forward.
Harry saw white and knew no more.
There was the loud screech of an owl as she dived after her master, disappearing into the
mirror in a flash of light as well.