Put it right after the unfair moment is shown, once the viewer understands what went wrong, and let it stand as the response before the scene moves on. Start the sequence with No No Wait Wait to flag the problem, then follow the complaint with Damn for a second reaction to the same behaviour.
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Shuk Reclamar is a short reaction clip, lasting about three seconds, built around a direct spoken complaint that lands straight away. It feels pointed and exasperated, like calling out something unfair in the moment, with a dry, confrontational edge that makes the objection clear without needing extra explanation.