Charging Needler glitch

This glitch can only be performed on the level Sacred Icon. When you find the Jackal and Grunts at the beginning of the level, destroy all the Sentinels and the Sentinel Launchers/ports to stop them 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 Carbine or any other weapons you can find.