according to the doctor, he went up to the cutter to tell him that he shouldn't cut in front of people who have been waiting in line and the cutter rolled down his window and grabbed him by the collar, told him to f-off, and threatened to kill him if he didn't go back to his car. that's when he went for his tire iron. they showed the doctor on television and he didn't seem the type to just get violent...pretty mild mannered.....i think the cutter is just a punk that got his bluff called and b*tched out. in all honesty, if the doctor was really violent, that crowbar would have already been through that window.
EDIT: here's the video...you be the judge
http://abclocal.go.com/kabc/story?se...cal&id=6197076