Just to tangent to a serious aside: Worst advice ever. When you have an enemy that has no way to escape, you will face the best version of that enemy because they are cornered. Always give your enemies at least the belief there is a way out as you beat them. They will do the rest for you...Give your enemies nothing to negotiate, no hope, no room to maneuver.
This is one of Sun Tzu's main points.
It is also one of the best techniques in avoiding street fights without having to back down. If you get ur back up but still allow a guy to feel he has a way to back down without looking like a complete pussy, 99 out of a hundred times the guy takes the out and backs down.