User blog comment:Masterzach32/Yomu - the Dark Wind/@comment-7709681-20140131010404/@comment-24132411-20140131141938

Yes, that is what I was trying to get at. So even though it's a small chance of killing the person at full health, it would smarter to wait till the target is low on hp

And its kinda like a karchus ult channel, where yomu stands still channeling while the target can do whatever the hell he wants. You just have to be within 300 range of the target to cast it on them