Wait and observe

Considering your stats and your current "equipment" the best you can do is not get involved. The library is a bit out of the way, so with a little luck any combatants that reach it will be weakened from fighting.

With nothing better to do you start looking for something to use as a weapon. There aren't many choices in a library and you are **** to settle on a heavy wooden chair.

"Not much, but better than nothing." You tell yourself as you hear the sounds of combat getting closer.

You do your best to remain hidden and watch through one of the library windows. Soon you see two men fighting a lone elven woman – and losing. One man is wielding a longsword and shield, the other is armed with a two-handed greatsword. Their opponent is wielding a pair of short daggers. Both men have greater range, but that clearly does not help them as they are being pushed back by the lone elf maiden.

As you watch the battle unnoticed by any of the three they get closer and closer to the library where you are hiding. Suddenly the man with the longsword pulls away, turns around and darts toward the library's open door. It's a short distance with no obstacles in the way and before the other two combatants can react he has reached the entrance. Once inside he immediately slums the door shut.

The man with the greatsword curses his companion's cowardice, then turns around and flees. The elf, not willing to let both of her targets get away, gives chase and soon both are lost from sight. The guy inside the library remains motionless as he listens carefully to the sounds of fighting coming from the outside. After a couple of minutes it becomes clear that the rest of the fighting is not getting any closer and he relaxes his guard... That's when you strike. You lift the heavy chair and bash him in the head with it. The guy falls down on his side, **** but still alive.

You take a quick look outside and see no one. Confident that you won't be disturbed you push the guy on his back and take a look at his face. You recognize him almost immediately – he is one of the guys that love groping your ass. Normally you would not be happy to see him... but right now he is at your mercy.

"Hmm... What should I do with you?" You wonder aloud as you consider the possibilities.