Imagine for a moment that you're playing a video game, one of those combat games you can play with a friend or acquaintance or even someone you've met online. In this game, you're on the run in an urban environment and your opponent is getting the better of you. You're running down a street with your opponent shooting at you, bullets ricocheting off walls to your left and right, just missing you. You turn down another street to escape the pursuing opponent, another near miss by a bullet. You spy an alley and run around the corner.
It's a dead end. You're boxed in with nowhere to go.
