Meh, just more self doubt like his dream about him being the bomb. The comics so far had been pretty interesting, just little side stories that usually added a little bit of info. This one wasn't really interesting.
I dunno, I got the Skywalker in the Tree feeling off of that comic.He's so convinced that he's the hero and he's supposed to save the world, but now he's got the doubts that maybe he's not the hero and he's the cause of the explosion.
That point is emphasized in the comic - he dreams he's chasing an invulnerable flying guy, but he can't actually fly - only when he's near his brother and absorbs his power can he fly. I think the comic is to highlight the "is Peter a hero or is he a cause of destruction" storyline.
I also think the Haitian is not a power cancel guy, but some kind of super-powerful psychic - the analogy would be Charles Xavier from the X-Men. I'm sure he could put up a psychic "shield" to prevent others from getting into his mind or sensing that he is there - and he extended one to shield Claire and her father from mind readers.