Purposeful friendly fire
Friendly fire can under certain circumstances have beneficial or otherwise useful effects.
Alternate names: Beneficial friendly fire, Useful friendly fire
The first video game about Purposeful friendly fire was released in 1997.
The parent tag should NOT be used if friendly fire is limited to only when this benefit can be gained. For example denial in MOBAs usually works only when the friendly is already very low in health and possibly with other limiting criteria (commonly requires they're also under damage-over-time effect).