I'm thinking the combat skills would be considered similar to 'when help is delayed' except an extra level more like 'help is not coming anytime in the near future'
Leaning me towards it being excessive care, stick to the abc's in that case would likely be best but that's when your conscious may kick in and steer you into doing something you know you are more than capable of doing
As to the op, good Samaritan protects you so long as your not negligent, seeing it done on tv does not mean you know how to do it
I've been at 50 or more accident scenes, providing emergency care to victims, and been called by an attorney only once, and he only asked if I saw the cause if the accident, and if there were any injuries or if I thought the driver was injured, sorry that was like 5 years ago, he never called again after my initial statement
Do what you feel is right, it usually is