[He forces a weak smile at the nickname before continuing.]

This world is the one I'm from... except it's a little different. When I found out what I was, I gave my friends a choice... to kill me and live in peace and ignorance until I brought about the end of the world, or let me live only to have to fight me.

When I tried to talk to my friends here, they didn't recognize me. They chose to kill me... so that means that the end is coming. I'm working to stop it, and... I think the only way is for me to be completely erased from existence.

[He finally pauses, letting that sink in. Hopefully, she doesn't argue with his decision.]