Video included

The argument escalated with the suspect walking over and picking up an empty beer mug, then walking back. The suspect then slammed the beer mug into the victim's face, knocking him to the ground.[waff.com]

It should have been obvious to the vic that the perp intended to apply to empty mug to his brain-housing group ... either he was completely oblivious or just didn't have a clue what to do to stop the guy ...