It makes no sense to me why XZ can't jump 50 feet. XZ can jump 30 feet vertically with no momentum. The most elite NBA athletes, which you can count on 1 hand, can barely do a standing jump of 3 feet. Last year, when the draft measurements were taken, none of the NBA prospects could do a standing jump of 3 feet although several came close. So we've established that XZ can jump 10 times higher than a world class athlete which is an amazing feat.
It's been brought up already that XZ wasn't capable of jumping across a 50ft chasm.
The world long jump record is 30 feet. With a standing vertical leap of 30 feet, XZ should easily be able to jump 50 ft, which is less than 2 times what the best athlete can do in the real world.
I realize this is ficition, I just want to discuss is the reasoning for a someone in Wuxia to be able to jump 10 times higher than a world class athlete but not be able to jump twice as far.