She may have decided to stop pushing, but he's still stuck on the apocalypse. Allison knows what caused it, how could he not after chasing it for forty years? After being there? They were all together, and... His head is pulsating so badly that he barely hears her next question, and he glares at nothing in particular.

"If I knew that, I'd know when to go back and stop it." He made too many mistakes, so pinpointing the right one isn't easy. "...Maybe something to do with the mirror."