Place it just before the moment someone finally joins in, after a clip of them watching from the side. Follow it with Why Are You Running when the challenge turns into a chase, or a short cheer once they take their turn.
About this sound
A short spoken clip in Portuguese asks why anyone would only watch when they could join in and do it themselves, lasting about two and a half seconds. The direct question feels like a playful dare, turning a passive moment into a nudge to get involved, take a turn and stop sitting on the sidelines.