There's a hell of a lot of difference between being backed off and backroomed. Backoffs are routine, but a backrooming is very dangerous, thankfully rare, and will likely require the services of a lawyer afterward.
Security departments hire a lot of unstable and criminal people so if you are ever faced with being dragged into a private area by them, consider it as serious as a mugging or a kidnapping and I recommend not cooperating. You are better off taking your chances with the cops when they come to arrest you.
Keep in mind that getting 'cuffed & roughed' by casino security guards is a potentially very high EV play.