Just before thread lock-up...
Let me say that when I clicked "Post Quick Reply" I thought my post would be the # 41. Other than that, I still think what para said is right on, and that the physical reality that most of us will experience with a good LP/SO will end up on a favorable note.
On the other hand, if you find yourself in danger, go ahead and defend yourself - you'll have your day in court (if you don't get killed by responding LP/SO/LE), spend close to $20k on legal fees, and probably end up with a misdeameanor (if you're lucky) or a felony conviction (loosing your priviledge to own firearms - yeah priviledge, we don't have the right to own firearms until SCOTUS decides something contrary to the US vs Miller issue or congress passes a law/constitutional ammendment that clarifies the problem).
Just calm down, tell security that everything is a misunderstanding and that you will cooperate, flip the phone open and dial 911/611 or local LE # - let LE sort out the problem. Besides, most locations that use LP/SOs will have CCTv recording what you are doing, they won't touch you unless you refuse to stay put after either party contacts LE - it's gona be pretty hard to argue that you didn't know they had powers to arrest/detain you (how it goes?... ignorance is no excuse for not following the law?).
Lighten up and get ready to enjoy some vacations at the business' expense (after you sue them in court and they settle), at the State Penitentiary (in case you loose in court) or wherever it is you go when you die (heaven, paradise, hell, Walmart, reincarnate into a snail, ect).
Just my 2 cents.