[Kotyara]

Actually, the best place to attack is the eyes.

if you get them, your assailant cannot see and will have to stop their attack - if You don't get them, you will still cause a reaction as your assailant will move their head to evade the strike which is very likely to be backwards. this will give you time to hit somewhere else to cause pain.

kicks to the knees especially from the side do great damage, scrapes down the shins are excruciating, hits to the throat are nasty, and a well placed hard kick to the thigh, if done hard enough, can cause the opponent to actually stop dead in their tracks. If they are wearing a tie (unlikely in this case) but that is a great 'weapon' to use against them - simply grab and pull them all over the place.

And noise, lots and lots of noise. It attracts attention and can disorientate your attacker.

And Tijs is right about facing your opponent; if you turn away you cannot see where he is going to hit so you cannot react or counter - they will see this and the beating will be hellishly worse. Stay on your feet and go for it - broken noses mend. other thing is that he may have a weapon - if they have you do not wish to turn and give him a nice back to stab. You don't want to be stabbed in the front either but at least you have some chance of fending off blows. Although if he has a weapon you really need the cavalry to turn up in the shape of Police or somebody who is prepared to help.

Still the best thing mind, is to avoid such situations in the first place - if you can.

Lee