Koryuko, rising topspin works perfectly fine for me when I hit x after a slide or getting knocked down. The only thing that I can think of is maybe the skill was on cooldown or something when you tried it? (I spam topspin a lot so it's almost always on cooldown when I get hit by a mob.)
If that wasn't the case, try manually pressing the skill key you assigned topspin to instead of x.
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