Bendis had a fairly short run on Ultimate X-Men. All things considered, it wasn't his best work for reasons I won't get into. That being said there was one stand-alone issue -- #41 -- that I thought was pretty effective.
The issue opens with a young teen (who I don't think is named except that his first name begins with 'J') who wakes up to find his house empty. Confused that his mother is absent, he leaves a note on the fridge and leaves.
At his high school he meets up with his girlfriend when suddenly...
Soon everyone around him is dead, leaving nothing behind but their clothes.
The kid flees to the caves when one night he gets a visitor-- Wolverine. The kid warns for him to stay back, but Logan tells him that he has a healing factor and it won't hurt him. He hands him a beer and tells him he was found by Cerebro.
He wants to know how many people he killed, but Logan tells him that he doesn't. He persists. The number is 265.