Avenger
From Halopedia, the Halo wiki
Template:Ratings Avenger is a multiplayer medal in Halo: Reach. It is awarded when a player kills an opponent moments after that opponent has killed a teammate on the player's team. Because this is a team based medal, it is only attainable in team-based multiplayer games or in Firefight Versus.
Gallery
A player earning the Avenger Medal in a Firefight Versus game.