well, our protocols do not specify MOI, except in the case of MVA or GSW i believe..they only specify signs/symptoms of spinal injury
anyway I found that PT had no neuro deficit, palpating the spine revealed no pain, and the pt was not complaining of head, neck, or back pain. he was fully alert and oriented, he was not intoxicated/under the influence of anything, nor did he show any signs of being under the influence, and had only minor injuries (3 small abrasions to knee and hands), and the PT stated his head did not even hit the ground (and there was no damage to his helmet).
from this i would say the likelihood of spinal injury is very, very low, as no signs or symptoms were present.
that would be my defense of my treatment plan.