-- continuing on a tangent --
As I recall, as long as you act in good faith you are covered.
See California's Good Samaritans Law
Quote:
...At common law, there is no duty to rescue another person, even if it is clear that the person will die without help. The duty may arise, however, if the two people have a special relationship with one another, like parent and child or husband and wife. If a person without one of these special relationships decides to help another, he or she must exercise reasonable care in rendering the aid. If the injured person is further harmed because the person providing help did not exercise reasonable care, then the injured person can sue for civil damages.

Since the common law rule provides little incentive to people to help one another in emergency situations, the majority of states have passed laws — known as Good Samaritans statutes — to make exceptions to this rule. Under California's Good Samaritan statute (Health & Safety Code §1799.102), those who act in good faith to provide emergency care at the scene of an emergency are immune from civil liability. ...

In the WFA course I took they stressed taking care of certain life threatening things immediately (breathing, major bleeding, et al), and then stabilize so the first responders have a living subject to work on/evacuate. Don''t make things worse (do no harm). In some situations making the person mobile so they can participate in the evacuation may be in order, but that's very situational. You may end up getting a fire going and setting up shelter to wait for an evacuation.

When I have the opportunity I'd like to upgrade to WFR (Wilderness First Responder); but simply knowing your limitations is useful.