Thanks Banh for his patience and expert opinion.
To summarize:
- if he's in front of you, punch/grab/twist throat
- if see a chance, punch/grab/twist balls
- run and scream while he's stunned/in pain
- try to put your weight behind punches to add force
- if he's already on top of you, pretend to go with the flow, hold his head and thumb his eyes HARD
- but I'd think ANY fight is better than nothing - nose, shins, kicking, biting, whatever you can do, just let your fury overcome your fear.
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- What about if he's grabbing from behind? Should one bite his arm/stomp his feet to cause a lapse, then turn and follow up with a punch to the throat/balls?
- I was also thinking, if I happen to have my keys in hand, maybe I can use the key to stab his throat/balls/eyes?
- I'm not sure if raising the fire alarm would have helped, actually it may make it worse because everyone's instinct is to walk out of the building. By the time the firemen came, the freak could have killed you already or kidnapped you to somewhere else... assuming you are free enough to pull alarm, better to keep running and scream HELP along.