Put it at the start of a defence sequence, then follow with Enemy Spotted as attackers approach and Bomb Has Been Planted when the objective is secured, keeping the build as the opening beat of the montage.
Über diesen Sound
This one-second clip is the Engineer's cheerful voice line announcing he is building a sentry gun, delivered in his confident Texas drawl. It feels playful and triumphant, like a job well done just as the defences go up. The line comes from Team Fortress 2, where the Engineer says it while constructing his sentry.