Place it right after the reveal that ruins the plan, then follow with the sad violin sound button for the aftermath shot. If the scene needs a cutaway first, put sudden suspense before it so the crying lands as the payoff.
Über diesen Sound
This is a nine-second clip of Edd crying, with sustained sobbing rather than a single tearful line. It feels openly sad and a little over-the-top, turning disappointment into mock tragedy that listeners instantly read as comic misery, making it perfect for an exaggerated reaction.