[@takashi] Surprise, you are not the only one I've heard use that joke lol.

[@importantnobody]interrupts are not allowed so long as the actions happening happen within a reasonable timeframe. I have a paste bin with all the specifics laid out, but I can't find the link. Essentially, if you are extensively prepping  and making it obvious, that's ground for a legal, logical interrupt. So no spirit bombs. Another example is monologuing, long series of attacks(the one attack rule essentially nips this in a bud in most fights, though). I'd say in most cases, interrupting things like that are a no-go, provided you aren't taking extra long or lollygagging while the whole time going ' nah nah nah boo, yew can't interrupt me', and exploiting the system. 

I'm curious as to why this worries you. This issue mirrors the issue with standard interrupt rules where someone can easily exploit the interruption rule to do it every post. Its a matter of sportsmanship under either rule set, because both to me are equally exploitable.