Rageblade on-hit only procs once per auto attack. (Hurricane, Twitch Ult, ETC)

Yes, I know the stack generation is supposed to be on-attack, and that works fine, but some clarity on how the on-hit at 8 stacks works would be great. I was expecting Twitch + Hurricane + ult to be hilarious, but it was only procing on my first hit :( Just specify something like "Can only happen once every .2 seconds" or "Only procs once per auto," so people know it doesn't work with hurricane, but still works with kog'maw's W.
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