I realize this is not a good answer, but in my opinion, people should not hike in remote/seldom traveled places without a SPOT or other signalling device these days.
But more answering the questions:
1. Make sure the victim is comfortable, attend to any bleeding.
2. hike to the trail head, drive until cell service is found. Call for help. Unless you are SURE there is cell service (based on similar prior experience with the phone), don't climb a ridge -- climbs can take longer than expected.
Not sure it is about ethics. It is just a matter of the best way to get help for the injured person as soon as possible.
