The cashier went overbored. The man could hardly get back up, or hold up his hands. The cashier could have tossed him out the door at that point, as big as he was. But first of all, the cashier had no business coming across that counter, once the threat was over. If he hadn't done that, I think the man would have eventually left.
At the beginning of the video, the cashier indirectly disrespected the mans woman, by asking him if that was his mother. Then the man was tryna tell him not to talk to her like that. Or the cashier may have said something disrepectful to her before the film started rolling. I'm not sure what the cashier said, but it must have been deep, to the point the man didn't mind getting knocked out by a bear. I'm mean that brother kept getting up like he wanted to get knocked out.