It is important to only do what is appropriate.
Self defence is concerned with expedience, with necessity, not brutality.
Prolonged combat is inadvisable. Always do the least amount of harm and end the situation quickly.
If you can drop someone to the floor, wind them or scare them off, do it.
Breaking bones, concussing people or hitting 'death points' is not so smart.
Nor is applying a hold or lock.