Why is this being changed??

Vampire
Drain Essence:
The stun from this ability and its morphs now occurs when the cast completes, rather than when it begins.

Is this a buff or a nerf? I guess you cast this at the end of you combo to stun when the player is trying to recover?

I always cast this at the end now to finish off slivers of health if players are that low.

Playing a class with a stun this is a non issue but when I play my Magden i have Essence or reach.

This change is odd and cant understand why it is being made.