Based on what you posted... you have what appears to be a self-inflicted shotgun wound or a point-blank GSW (the shotgun in the drivers seat would be more indicative of attempted suicide without a current gun battle or reports to sustain that theory.) Why are SD's (SO) concerned about another person, was there a gun fight or a domestic (DV) who sought safety nearby and is not a threat? If there is still a threat why was it cleared? Use the fire apparatus as a shield if possible at this point - you are in the sh!t now.
Since you can't be certain the scene is still safe, you have a tough choice to make. Save the life and risk yours, or back off and possibly lose them. Protocol says you immediately back off to a safe position and wait for the all clear again. (Officer safety rules)
Medically speaking this one is easy... Intubate, pack and transport. C-Spine control is secondary to patent airway and controlling blood loss. Cricothyrotomy is not indicated as the patient has an airway it's just not secure - a tracheostomy is going to be the definitive treatment (Cric only if intubation fails). Packing the wound and wrapping the head around the endotracheal tube is faster and better than trying to identify and clamp individual bleeders. You will still have to pack, why clamp (unless you can see an artery), remember faces bleed a lot but not much blood is lost. If he blew out a carotid you probably don't have a viable patient when the scene is safe.
If you in fact decide to deedee mau with the victim and before treatment is begun, two person under arm carry face down to a safe location then treat as above.
(former 18D/EMT-P now LEO)
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