That is pretty much the manual.  Watch a cop after pulling someone over.  They never stand in front or behind the car.  They stand beside, and even then only if the driver turns off the engine.  A security guard dealing with a trespasser in a vehicle should probably act much the same.  If the trespasser is in a vehicle, it might be time for them to retreat or at least get into their own vehicles if available.<p>If they are not trained in how to approach and deal with suspected wrongdoers driving cars, something that is not uncommon in large facilities, that lack of training is a serious issue for their employers.