Multiple invincible Grunts

This glitch will only happen in Halo: Combat Evolved, level Assault on the Control Room.

To do it:

Just before you get to the Hunters, activate a checkpoint. Then, go to the U-bend (The hall with no doors and lots of beams) and search for an Active Camo there. You should find it near the second to the last beam. Once you grab the camo, run as fast as you can towards the Hunters, without shooting at them or touching them. You could grab some ammo at the weapon caches. After that, run toward the next door. If you loose your active camo before you can run to the door, or if you get spotted by the jackals near the door, just load your last checkpoint. When you enter, you should see two Jackals, three Grunt Minors and one Grunt Major. Don't mind them. Just go forward until the words "If I Had A Superweapon..." appear. Then run back and you'd notice the grunts don't move. They just stand there and whatever you do (even meleeing them, shooting them or throwing grenades at them), they won't budge. Go back to the