What is this class design of Dancer?

[WaterShield]

Using every 30s is not a great idea, but let me explain why:

Standard finish needs 4 GCD, your regular single target (x2) combo is 900 potency vs 1000 potency from the standard finish. Sounds good, right? Sure, but there is a catch: dance moves can't generate flourish procs, and you want to generate as many procs as you can. After all, a dancer has 3 layers of RNG: Flourish-> Feather-> Fan III.

Standard finish does not need 4 GCD's. Each step move takes 1 second. GCD is 2.5 seconds.

Standard finish is 1000 potency. Cascade is 200, Fountain is 250, using these 2 skills takes 5 seconds. Standard finish takes less time to cast than this and hits almost twice as hard.