Huh, Not entirely sure. Is it feral, do you know? If so, you probably don't have a good chance of catching him yourself or being able to help him. I would recommend calling animal control (or whatever they call it where you live) or a shelter and asking what they recommend and or if they could help the cat. If it is feral, don't try to touch it cause he could get very aggressive and attack because he isn't used to humans.