Invisible grenade throw
From Halopedia, the Halo wiki
This is a special trick on Halo 2 where a player can throw a grenade without their character physically doing so.
The process is simple. Grab a Sentinel Beam and shoot until it overheats. Then when it is cooling down, throw a Grenade. The grenade will seem to be coming out of you, you don't see your hand throw it. This trick works with both human and Covenant Plasma Grenades.
