I don't know what happened. He said that the rest of the security guards were doing their job. I've been to a bunch of megadeth shows back when Marty was still with them and the security guards were always well behaved.
The last couple shows I went to with them the security said if they catch you going over the wall 3 times they kicked you out. Seems reasonable i guess. The amon amarth/carcass/Obituary show i went to even had women security guards to grab women crowd surfers which I thought was really smart on the club's behalf.
I've been some shows where these giant security guys beat the hell out of someone a quarter of their size. Even if the guy threw a punch they are typically big enough to wrap them up and get them out. I'm a small guy and have been hit a lot over the years and oddly enough I've never been incapacitated by a punch to the head. I got beat up by like 4 rednecks from a neighboring bar after a punk show cause the girl I was with was talking shit. I looked like Rocky after with both eyes swollen shut but never went down. Now if they hit them in the throat, the magic button on the jaw, stomach, or nuts they felt it if not they probably didn't. It's tough to make a call without seeing it but I imagine Dave, Bruce, or whoever has a financial motivator in making sure every one comes home safely even if they were a dumbass.