Australian Open 2022: what can Collins applaud, and what can Barty smile about?

Maybe on Collins???
Or any other idea what happened here?
Australian Open 2022 Women's Singles Final, Ashleigh Barty vs Danielle Collins
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Collins is applauding the spectators sarcastically because they applauded her unforced error. Barty sees that and smiles at Collins' protest towards the spectators.

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