All good points!
Keep Keys in a striking position!
If in front of you, never hit with your fist. Curl fingers and stick in the Nose! Push it up they die!
Kick in the crouch, step on the instep or top of foot. Then run like Hell, scream at the top of your lungs.
In front. curl your fingers not in a fist, hit in the Thorax (Throat), will kill them or get them chocking.
Be submissive at first, do not panic! Look for an opening!
If all else fails, shoot the SOB!
If in front coming at you run like hell and scream like hell!