N766UA, you hit the nail on the head.
He definitely was provoking the kid and "looking for a fight." Video began with the guard saying "I'll break your arm".
I know a big, bad, muscled guy and he works as a bouncer, he says you intimidate by your presence, but you also don't provoke needlessly and smart ones know the difference. He could have by his size led the kid off the property and said, you come on again, you'll land in jail or something like that, and if the kid came on, he could have got the kid in a head lock and thrown him off the property, but no, fat ass guard was mugging for the cameras (saw too many action movies) and was also going after the person *with* a camera (which in a public place ain't illegal, you don't like it, too bad.)
Too bad the kid couldn't fight. The guard deserved a fat lip to go with his beer belly.
I may be ugly. I may be an American. But don't call me an ugly American.