The Identification Gap

The Defender's Disadvantage When Entering a Room

One of the greatest disadvantages faced by a law-enforcement officer—or an armed citizen protecting family members—is confronting an active shooter who is already positioned inside a room.

The active shooter begins with an important advantage: the decision to shoot has already been made.

The suspect can focus attention on the doorway or other likely point of entry and fire at perceived movement without first determining whether the person appearing there is a victim, another responder, or the threat. The first responder has a completely different problem.

An officer or armed citizen cannot simply shoot at movement. The responder must enter an extraordinarily complex visual environment and rapidly:

• Observe the room and its occupants.
• Distinguish people from objects.
• Identify hands and potential weapons.
• Differentiate victims, bystanders, other responders, and the suspect.
• Determine whether a person actually represents an imminent deadly threat.
• Make an appropriate shoot/no-shoot decision.

Only then can deadly force appropriately be employed.

The Identification Gap

This creates an inherent identification gap. Think of it in terms of the OODA loop: OBSERVE → ORIENT → DECIDE → ACT

The responder must move through that decision-making process. The active shooter may already be at ACT.

During even a short period of recognition and decision-making, a suspect who is already oriented toward the doorway may potentially fire multiple rounds. Depending on the weapon, circumstances, and rate of fire, several shots could occur before the responder completes threat identification and reacts. The important teaching point isn't a universal number of rounds. It is that fractions of a second matter when one person has already made the decision to shoot and the other still has to determine whether shooting is justified.

Don't Give Away the Advantage of Cover

One way of reducing that disadvantage is to avoid unnecessarily abandoning available cover simply because the threat is located inside a room. A doorway creates danger, but the surrounding structure may also provide opportunities to limit how much of the responder is exposed while information is gathered and the threat is confronted. Whenever circumstances permit, responders should use available cover and minimize unnecessary exposure rather than automatically placing their entire body into an open doorway or room.

This changes the problem for the attacker. Instead of the responder immediately becoming a fully exposed target inside the room, the attacker may be forced to engage a more limited and less predictable exposure while the responder retains whatever protection the structure provides. Where deadly force is legally justified, the responder does not necessarily have to surrender available protection merely because the suspect is farther inside the room.

The broader principle is: Use available cover. Minimize exposure. Positively identify the threat. Employ force only when legally justified. The exact technique for doing this—including positioning, angles, weapon presentation, movement, and use of a doorway—requires competent hands-on training and must account for the construction and ballistic limitations of the apparent "cover." A doorframe or wall should not automatically be assumed to stop gunfire.

There Is Also a Rescue Consideration

There is another important advantage to maintaining a position near available protection rather than unnecessarily moving deeper into the room: rescue and recovery. If the first responder is struck by gunfire while still outside or near the threshold, other responders may have a better opportunity to reach, extract, and treat that officer without immediately entering the suspect's position. If the responder is wounded deep inside the room, rescue may require additional personnel to enter the same dangerous environment, potentially creating additional casualties.

That leads to an important tactical and medical principle: Your position affects not only your probability of being hit—it can affect whether other responders can reach you if you are hit.

The Fundamental Asymmetry

Ultimately, this confrontation is inherently asymmetric.