Board Thread:Legitimate Canon Questions/@comment-98.66.203.214-20140324012120/@comment-4091815-20140324024243

He was becoming an Alpha - he'd had flashes of red eye but had not taken that final step. It was still possible at that point that killing might have altered his "true alpha" path somehow.

He didn't know and, the more important point, he didn't care about any of that as long as he could save the people he cared about.