Hey, you know, I'm not a violent person or anything, and I love animals, but it's time to either call animal control or else kill this motherfucker.
I don't think he needs to kill it ---- plus he's in Manhattan so he can't exactly borrow one of our 16-gauge jobbers --- but rather pick up one of those super-soaker water guns and drill the sucker a few times over with some good 'ol H20. My guess is he'll bolt.
Nah, use ammonia or something like that. Gotta send a message, and maybe do some harm to get him to the point where nature takes him out. This squirrel is definitely, like the man says, wrong. Action must be taken.