Ds13 was out with a friend, tried to get off his bike to take it down some steps, got caught on the bike and fell with it down about 8 concrete steps, landing on a small bridge at the bottom, his shoe fell off into the water and he was stuck under his bike. His friend said he hit his head (he was wearing a helmet) and his arm whacked against the edge of the bridge. Now my issue is he says he can't move his a at all, no signs of any swelling. Where it gets tricky is ds has autism and is hyper sensitive to pain. I have no idea how to tell if he is refusing to move it due to the idea of pain or if he actually can't move it. It's not uncommon for him to not move arms/legs etc when he has knocked them but equally he hasn't had a big fall like this before. His friend said it looked horrible and ds was clearly in shock when I got there. When I arrived he was shaking head to foot and said his arm had stopped hurting and gone numb, then starting hurting again when I tried to get him up. Don't want to take him to get it checked out if it's unneeded but don't want to miss an injury. I suspect just bruising and shaken up but not 💯 sure.