exactly. i would be getting my superior involved. the average guard on the stand has no place getting the police involved as the immediate next step. if my superiors want to bring the cops into it, that's there call, not mine. but as i understand the law, even cops can't lay a hand on you just b/c you tell them to f--k off, either. sure, they can slap you w/ a citation or arrest you, but they can't strike you. that would be assault, no matter what uniform you wear. then again, if the situation is far enough out in the water so that someone watching from shore would have trouble judging what was happening, the guard could "force" the situation, causing the offending person to be in distress. then drag his limp, unconscious body to shore. "i dunno, sir. he was yelling at me, then he just passed out."