Freaking "security guards"! (sigh)
They need a license in most cases, but it doesn't necessarily mean they know crap about the job they are suppose to be doing. I can talk, I WAS one way back when, but I was a far different breed from a "mall cop".
The witnesses this guy has are going to save his bacon. The SG got what he deserved for a Rambo BS stunt like that, but I think the guy should still press charges.
I have seen entire security firms be fired from a contract for similar "beyond authority" actions of a single security guard. Incidents like these don't reflect well on the security firms who are suppose to be training these guys.
A a minimum, this security guard is probably looking at a long investigation and riding a desk at reduced pay, if not termination.