Charging Needler glitch

This glitch only works in Halo 2.

On the level Sacred Icon when you find the Jackal and Grunts at the beginning, destroy all the Sentinels and the Sentinel Launchers to stop Sentinels from coming out. If the Jackal is charging his Plasma Pistol after the battle, switch it with a Needler. If done right, the Needler will fire but no needles will come out. Try it with some other weapons like the Covenant Carbine or any other weapons you can find.