As Rid has been saying, he should have been back boarded, not because it necessarily would have done much good, but to cover your own behind. Everyone will give the, "he could have had a spinal injury" or "this treatment works better" and there is always a possibility of that, but an even bigger reason is that if he turns out to have some neurological injury, and you didn't backboard, the court is not going to side with you unless he refused. It shouldn't take you more than 2 min to backboard even the most difficult pt except during an extrication, so if it is taking you 5 min or more you should pull out a board at the station and practice a bit.