fine behind him/in front of him, you jump when you don't mean to. That has nothing to do with skill but with poor ui and ability design. When 1 ability does 2 things, and you dont want one of those 2 things to happen it's not fun. (especially when you have another ability that does the same; shadowstep.)
Saying a good sub knows how big the hitbox is of every boss (when theres no indicator or standardisation) seems like a ridiculous notion to me.
anyway as I said, you're free to disagree with me, but I don't like that part of nightblade, id prefer a deal x dmg ability.