Team Fortress 2, released by Valve in 2007, introduced domination lines that trigger when one player repeatedly kills the same opponent without dying. Each class received specific taunts for every rival class, and the Engineer, a Texan builder who relies on sentries and teleporters, got a dedicated set for the Sniper, the game's long range marksman. Files like engineer_dominationsniper04 circulated through game extracts and soundboards, becoming a shorthand among players for a one sided matchup and a familiar clip in TF2 edits and community videos.