[my_ghola]

If you have a gun and shoot at the active shooter, you become the active shooter.

[CompanionCuuube]

Definition of an active shooter: "an individual actively engaged in killing or attempting to kill people in a confined and populated area; in most cases, active shooters use firearms(s) [sic] and there is no pattern or method to their selection of victims."

[jstarfish]

Semantics wasn't the point. When police get reports of an active shooter on campus, you don't want to be the one seen holding a gun when they arrive.

[Whitestrake]

A person who attempts to shoot an active shooter therefore satisfies the definition of an active shooter.