Put it at the beat where the follower steps into frame, after Why Are You Running and before a shocked reaction, so the pursuit stops and the scene ends on the follower freezing in place.
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This is a 2.6-second Russian voice line saying 'don't follow me', delivered as a blunt warning to someone trailing too closely. It lands as irritated and dismissive, with a comic edge that makes the scolding feel playful rather than angry, like a friend snapping at a copycat in the middle of a joke.