I never second-guess the actions of another EMS provider if I was not on the scene, or if I lack 1st hand knowledge of a particular patient. There are exceptions, where it is clear the actions or lack of action by an EMS provider clearly violated the standard of care.
I will say, that here in Maryland we do have a protocol for field clearance of possible C-spine injuries, which I have used, but with the greatest of caution. However, if there is/was any doubt, it is always better to be conservative and treat the patient as though they did have C-pine injuries.
I have, when 1st on the scene and without an EMS unit coming anytime soon, performed a quick neurological exam and in the absence of any indicators (pain, deformity, numbness, weakness, neuro-deficit) allowed the patient to assume a position of comfort, which might be sitting or laying down, especially to treat potential shock.
On a more positive note - Matt, congratulations on passing your exam.
Pete