Sorry to hear about your ordeal, as i know i would have flipped a conary and probably even attempt to use my car a weapon... just saying....
anyways, galleria mall (the plaza which holds the mc`ds you went to) is constantly surrounded by those clowns! I`ve had friends jumped there, and one a few years back stabbed while ordering his food. its like you said its groups of them. alone they wont do so much as lift their heads to look at you.
as gay as it sounds, u need to be very aware of your surroundings! and do whatever you need to do to get out of a shitty situation. i obviously wasnt there but i find myself thinking, werent u able to move your car forward, or reverse and get out of that situation.... or even, why didnt you follow them after they did that...
anyways sorry to hear about this man!