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The Overheat grenade is a button combo in Halo: 2.
When you release a Plasma bolt after the pistol is charged and released, you can hit Y and L quickly after each other and the Grenade will fly without its throwing animation. It especially helps if you missed the plasma shot, because your opponent will most likely take cover behind a wall. After the grenade is thrown, there is a small time you cannot shoot, but doing a cancel reload (Y, Y) fixes that.