the ####head in the car was speeding, the Jims guy probably got a suprise and rashly tryed to change to the other lane to get out of the way.
I thought the filming guy was speeding too ? car seems to be revving hard.
Doing a u'y with a trailer is always testing, it seemed pretty tight, then he realised the situation & went for it to get out of the centre lane. Actually there were 3 lanes & it looks like he would have been better heading for the outside lane, although he then would have had to cross the centre lane.
Not easy making an unintended split second decision, easier to just be an arm chair expert.
Final verdict, Jims guy still in the wrong, but a bit stiff ? just my opinion.