I have the passive for umbral blades called “Precision Cuts”
This causes my umbral blades to only travel to my targeted location, instead of the max distance in the direction of the cast.
You can see here it is going way beyond that.
Also, there is a delay on casting it at all, which seems to be as if the bladestorm is being converted from regular umbral blades and seems very clunky in it’s conversion.