This video seems to show inconsistencies and strange things more than described prior:
9 seconds only one stop sign on right of crash spot, a news photo referenced previously showed two stop signs on the right.
44 seconds impact between the Challenger and the pickup
50 seconds guy in army jacket and black helmet, apparently the same guy who was hit is back up and running full speed trying to catch the car that just hit him
54 seconds scratches on the pickup
1:00 scratches apparently not there on pickup
1:03 side mirror damaged on pickup
The vid is two sections, the first sequence is regular speed, and the second is slow motion of the first sequence.
Does that clear things up (or does it raise more questions?)