[Oh geez. He knew the basics but the concept of alternate realities still weirds him out.]

There's some... different version of my world out there, or so I've heard. Different me, different Al, and different histories. The Al who was here before wasn't really my brother, but... the brother of some other 'me'.

[And then, because that sounds ridiculous-]

...It's weird, I don't really get it.