Place it immediately after the failed moment in your edit, then follow it with the sad violin before cutting to Nelson's mocking laugh for the payoff, and end the sequence there instead of adding another reaction.
Über diesen Sound
This short Spanish voice clip repeats 'qué pena, qué pena' over about four and a half seconds, the words delivered with a slow, mock-sympathetic tone that makes a failure sound worse than it is. It feels teasing and lightly cruel, perfect for a moment when someone deserves a little public sympathy they did not ask for.