Place it as the reaction beat right after the reveal in your edit, and build the sequence with a sudden suspense hit leading in, then follow it with the oh my god wow reaction for a second, bigger response from the crowd.
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This clip is Batman speaking in Portuguese, saying 'eu não acredito' — I don't believe it — in a short four-second voice line delivered like a stunned reaction. It gives listeners a mix of disbelief and dry amusement, the feeling of hearing something so unlikely that refusing to believe it is the only honest response left.