choke point

In military strategy, a choke point (or chokepoint) is a geographical feature on land such as a valley, defile or a bridge, or at sea such as a strait which an armed force is forced to pass, sometimes on a substantially narrower front, and therefore greatly decreasing its combat power, in order to reach its objective.

fish knife - cut down tool

"Removing the ligature from a prisoner as swiftly as possible is crucial to ensuring the best possible chance of surviving and avoiding long-term or permanent brain damage."