Place it at the reveal moment, after the setup clip and before the group's reaction, so the accusation lands as the punchline. Follow it with Bruh Sound for disbelief, then Emotional Damage Sound to stretch the fallout, keeping the rat callout as the centre of the edit.
About this sound
This is a 3.5-second Russian voice clip in which a speaker delivers the blunt phrase 'Ebat ty krysa', calling someone a rat for snitching. It feels confrontational and mocking, with a burst of amused disbelief that makes the accusation land as a joke rather than a serious argument.