If you know you are out-numbered in a situation and the best thing to do is run, how would you talk your way out of it (so you can get a chance to jet)?

I've heard different things like:

1) Smile : Try to act like it's all an accident.

2) Turn Your Body Slightly Sideways : Gives less of a target.

3) Avoid Their Personal Space: Try to get them to stay out of yours.

4) Keep Your Hands and Arms Open: It's less threatening.

5) Never Turn Your Back: Don't give a coward a chance.

Personally, I don't agree with #2 & 4 cuz it seems to leave a person too vulnerable. What are your thoughts/tips??