"I am," he confirmed with a light smile as he pushed up to his feet. "I... well, I'll miss some people. Lily was... well, she was already gone in my time. I'll miss the potion, as well, but I don't know. Maybe I can get Sirius out of prison."
He thought Dumbledore would believe him and if they could find Pettigrew, that would prove it even if his story was crazy.
It wasn't as if he hadn't briefly entertained the idea of going into another world. It wouldn't solve his werewolf problem, though, and he thought he should try to do this for Sirius if nothing else. If they could defeat Voldemort for good and not have to go through a second war as well ... even better.
He put a hand on Tyler's shoulder and squeezed gently before moving to the door. He did feel like there could have been something between himself and Tyler, and he'd probably entertain thoughts about how it might have been for a while if this actually got them home.