http://www.cnn.com/2015/04/20/us/fre...more-timeline/
So, video didn't show any use of force, he was up and yelling when he was put into the wagon. Reports are, aside from the spinal cord injury, there was no other sign of injury to Gray (no leg injury despite people claiming it appeared it was broken on video). So, either he already sustained a major spinal cord injury prior to being loaded in the wagon (I think we can agree that's unlikely), in the four minute window where another unit was requested the officer driving the wagon stopped, removed him, and at that point he was beaten and sustained that injury (perhaps that's reasonable to people like PoundingTheUnder), or his injury happened inside the wagon, where he was by himself. The van wasn't involved in an accident, so I guess the other guy's account is pretty important.