Place it at the opening of a challenge sequence, then follow it with the Victory Sound Effect once the task is won, keeping the whistle as the call and the second sound as the payoff.
About this sound
This short whistle plays a clear, high four-note melody in just under four seconds, with no other instruments or voices behind it. It feels tense and hopeful at once, like a quiet signal cutting through danger, and it comes from The Hunger Games, where the melody is a small moment of recognition for fans who know the films.