Im a bit confused as to how 'severing his connection' to the staff would help against my attack. I was under the inpression this weapon was in fact his soul. Even severing his connection to it, would it not still be a wholly spiritual construct given shape? I don't imagine this is a polearm infused with his soul, but literally an extention of it. I cant imagine severing it would both rid it of its magical conductiveness and still be able to exercise control over it.

Edit: This is also happening at lightning speed literally, since this ethereal lightning moving through his staff is equivalent to electricity coursing through a metal. On that note, if one were to send an electrical current through a bar of metal, cutting the metal in half would not sever the current. Youd just end up with two electrified bars. Unless youre arguing that you cut off the metal [i]before[/i] the current passed through the rest, and that's what I'm getting from the post, I don't see how the technique would work. And that's a huge stretch even by pc standards since it was channeled on contact thus nullifying any form of believable preparation for it.