Cowardly Grunt
From Halopedia, the Halo wiki
Template:Covenant Character Infobox
In the Halo 2 level Uprising, in the first room after the cavern, there are three apparently dead Grunts in the corner of the room. The center one is, in fact, actually still alive.
If you approach him, he will say, "Please, no hurt! Me like Elites. Brutes stinky bad bad. Me stay here, make sure no Brutes come behind mighty Arbiter. Heh, heh... Eh?" (listen)
He will not follow you, and if you push him to a battle, he will not fight. He also dies with only one shot.
