Zion, or rather Shura, hunted down every last vampire and tortured them for an entire month. The only reason there were any survivors was because, the moment the others saw Shura lose control, they abandoned the battlefield and left it to the beast. He was unrecognizable—no longer Alpha Zion, but a feral force of destruction.
Some weren't lucky enough to escape.
There were unfortunate casualties from their side too—shredded beyond recognition, their bodies mangled until not even bones remained. Some of them belonged to another pack.
Greg, sensing that something was wrong with Zion before the shift, had barely managed to warn his own pack. They fled as fast as they could, retreating to safety.
They didn't return until the next day.