Hard to imagine the scene but we better prepare for it mentally....
Be prepared mentally and watch your surroundings. Look for the exits. Look for what may be a potential weapon. A commercial kitchen is full of lots of nasty weapons from a cleaver to a pot of boiling water.
Don’t be a victim and just beat the living crap out of any thug who tries this stuff. Then beat him again. Pick the leader and flash mob him or her. When one of them is lying in the street and his momma can’t recognize him, then the rest will think twice about trying this again.