Yeah, the way he waved his arms he was trying to get up but his lower body wasn't responding like his upper half was and he grabbed his lower back which sounds like a spinal break for sure. At minimal temporary paralysis, but with the force of that hit probably more severe.
People need to remember this the next time they call football players greedy for holding out for more money or negotiating tough with teams. In a game where one play could end your life as you know it get as much money as you can as fast as you can. The 9-5 desk job they call football players greedy from likely doesn't carry the risk of death or paralysis every couple minutes.