Matthew stopped the sword of the one that attacked him, only to get shocked the moment he was attacked. It wasn't a strong shock, not enough to wound him. But it was strong enough to get his entire body to convulse for a second, and even get close enough to drop the sword in his hand.
That was why he had interlocked his fingers around the sword's handle, making sure that even if he was shocked enough to want to let go of the sword, he couldn't.
He was still trying to learn about his own powers during the fight. He needed to be careful as to what it was so that he couldn't accidentally do something to his enemy that helped him, or do something that harmed his allies.
He had gone through this dozens of times by now, so he was aware of what he could and could not do in a battle. The main thing to realize was to never use the powers on a human.
