OK. Legally he can carry at his place of work if his employer gives him permission. Open or concealed, once again is the owner's decision. If he chooses to use the weapon in any given senario, his actions will be open to question by police or jury like any other shooting event. Keep in mind, using a firearm should be your last and most desparte alternative. The presence of slcohol in the bar makes it worse. The idea of him drinking could shift the potential outcomes. He has to make a choice.