[Making a band? Fans? Selfies? What is he going on about? That sure is a funny way to say 'Doc, how've you been?' or 'Doc you're late'. There's no friendliness there, no recognition...it's like they've never met.

Have they somehow altered the timeline so severely that their bond is broken? He feels his stomach churn at the thought. And if that's true, it's only a matter of time before the alteration reaches him too...they'll be lost to each other forever if he can't do something, but what?

First he ought to figure out what went wrong. It's made more complicated due to the fact that for what's likely the first time in their relationship, it's Doc who can't understand a word Marty is saying.]

What the hell is a selfie? Oh---oh never mind, that's not important!

[There's the wild-eyed stare. Doc gestures dramatically as he talks, pacing back and forth, then reaches...no, Marty doesn't know him, he can't scare him like that.]

What's important now is that no, I'm not a fan, I'm your friend---yet that doesn't appear to be true for you, and I need to find the cause of that temporal disruption and neutralize it before the effects are permanent.