First, this is the video of how it went down. Probably NSFW because of the violence:
Second, the name of the guy who sucker punched him is Tony Camargo. He was stupid enough to wear his jacket with his name embroidered on it when he slugged Crowder. It was all caught on camera.
His whole name is shown briefly at 1:32 in the video below.
And here is Crowder’s response. He challenged Camargo to an MMA fight.