But she held your arms back right? Fuck that. Stay in the car, close the doors and windows and be a spectator. Otherwise, she can be another liability.
Anyways, depending on the opponent, you either choose to strike or submit. The reasoning is fear and confidence...and some compassion. If this biker scared you then you gotta pound him out. If you're not scared, you choke him cuz you don't wanna hurt him.
Many times a falling opponent can hit their head and die. It's not worth it so a well timed submission resolves the issue. Fuck bikers.