From the pic, his front tires weren't in the track so he was probably thinking he was in the clear. What gets me (assuming I'm understanding the whole story) is that he just stood there watching it walk over his car and made a phone call to ask what do to, instead of running up and turning off the pivot at the first sign of trouble. Take some initiative, man! Shut it down, then call the boss and own up to your mistake. And saying "Your pivot is running over my car!" doesn't qualify as owning up to your mistake.