What is an example of a fatal funnel?

A fatal funnel refers to any location where individuals may be vulnerable to attack or exposure while moving through a constricted space, typically entering or exiting a structure. A doorway exemplifies this concept because it represents a narrow passage that an individual must traverse, making them more susceptible to an adversary's line of sight and potential gunfire.

When a person approaches a doorway, they are exposed as they transition from one area to another, which can be particularly dangerous in a tactical situation where there might be a threat on the other side. This increased risk associated with movement through doorways makes them critical points that law enforcement and military personnel often strategize around during operations.

In contrast, balconies, rooflines, and windows can have varying levels of exposure but do not inherently pose the same concentrated risk as a doorway does when considering entry and exit points in a tactical context. Therefore, the doorway is the most fitting example of a fatal funnel.