[ Wow, okay, several things stick out to Matt at once. The first thing is holy shit those are images, blurry or not, there's way more detail to them than Matt's visual memories ever had. So that's, you know, alarming. He didn't realize that was a thing, when all his memories are blank shapes and darkness (sorry, Pete.)

The next thing that sticks out to him are obviously the memories. They're certainly not his, but they're about him. Is that what looks like? He doesn't remember any of that. Certainly not dying. He isn't dead, that's a fact (and something he projects with certainty.) Alternate universes are no secret to him, so he's not exactly shaken by the news. Maybe a little upset. He can focus on it later. Great way of dealing with your emotions, Matt.

The last thing he notices, which is perhaps the most obvious thing of all, is that the voice being projected in his head is definitely Peter Parker's. Though he sounds several years younger, and Matt knows voices, he can tell. ]

Peter? Well maybe not the Peter I know, but. Peter, I'm not dead. I also don't think I'm the same Matt you know.

[ He's no less concerned though. Spider-Man has always been a good friend, maybe that bleeds in a little too. What's a younger Peter doing thinking he's dead? ]

Peter, why do you think you died?