Help with a knockback weapon mod and finishers

[EpicBlu]

I used CK to add the Werewolf Knockback effect to Volendruung, because I thought it was kind of stupid that killing someone with a hammer nearly as tall as they are didn't send them flying. While it worked like a charm, I have a new problem: if I ever trigger a finisher on an enemy, then they become immortal and cannot be killed, even with the console. Is there any way to fix this? It doesn't happen if I use another weapon, IE one without the knock-back.

Edited January 17, 2015 by EpicBlu