Place it just before the risky decision in an edit, then follow it with sudden suspense as the plan unfolds, or cut to a no no wait wait moment when someone tries to backtrack. For a bigger reaction, pair it with an oh my god wow beat after the consequences arrive.
About this sound
A short, roughly one-and-a-half-second spoken line from JonTron, delivered in a flat, wary voice as he realises a situation is turning bad. The clipped delivery makes it feel suspicious and uneasy, like a warning before something awkward happens. It works as a dry reaction to bad ideas, strange plans and conversations that are clearly heading in the wrong direction.