Place this clip right after the mistake is shown, so the reaction answers the failure instead of introducing it, then follow it with Awkward Crickets while the camera holds on the aftermath, and use Victory Sound Effect just before it when a confident win suddenly turns into a blunder.
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This is a very short voice clip of Inugami Korone saying "Oh no", lasting just over a second. It feels instantly funny and sympathetic, like catching a friend realising a mistake a moment too late, and it is a line from the Hololive VTuber.