I think you’ve actually posted a screenshot of this once before, where you can see the flashes of gems matching in the background of the loading screen.
I actually also posed this question (re: Yao Guai’s third trait killing the last enemy and animation speed slowing down) to Ozball during the Halloween(?) stream last year, but I don’t think it translated all that well, and I think he gave a similar answer to Kafka above.
Edit: Ah, not you, sorry - the other forum poster whose name begins with ‘S’ 
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