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Message: <blockquote data-quote="DracoSuave" data-source="post: 4596389" data-attributes="member: 71571">:facepalm:You missed the point.The strict rules about it is a blank slate.  There's nothing saying you can't immediately interrupt an action that you cannot see. (which is not the same as cannot detect).  There's nothing saying either way and you as a DM have to make a call.  You can't even HAVE set rules in such an instance because there's too many variables that make an interpretation right one with this time, but not right this other time.  It's part of a DM's skillset to be able to make these calls in such a manner that is logical from the manner of the story run and the situation at hand.   You can't give 'strict rules lawyer' advice in a situation like this because there IS no strict rules law in this situation.  That's why you'll get suggestions rather than strict rules argument.That said, if you determine that you need to be able to -detect- the invisible guy then there's rules available to determine how to detect him.  It's a Stealth/Perception situation.  If you end your thinking at the previous paragraph however, then you just allow the immediate interrupt.However, the interrupter needs to be able to guess which square the provoking shifter was in before he shifted.  This may be easy and trivial, or it may be difficult and impossible, that can only be determined in context of the battle itself.</blockquote>