looped skill with ending animation

[YinYin]

Yes, hit_d is required. However you can prevent the key from working by adding and impossibly high mp value to the frame it leads to - e.g.:
<frame> 296 mp: 600
You will still be able to stop it by pressing backwards while your character is touching the ground (this is used to stop Firens D>J like normal running).

Now the video cannot really show me that it doesn't stop into 296 correctly - or does it?

edit: good spot on the cpoint decrease STM - that can be removed or replaced with whatever Louis' whirlwind throw uses to not stop early.