Place this clip at the end of a failed play sequence, after the mistake itself. Lead in with the Enemy Spotted Sound Button to set the threat, follow the error with this line, then close with the Nope Meme Sound Button for the walk-away reaction.
このサウンドについて
The clip is a short spoken line, 'thought we could count on you,' delivered in a flat, disappointed tone over about two seconds. It gives a listener a sense of letdown and quiet betrayal, like being called out after failing a teammate. It comes from Metal Gear Solid V: The Phantom Pain.