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Message: <blockquote data-quote="eamon" data-source="post: 4440932" data-attributes="member: 51942">Certain actions can interrupt other actions.  The interrupted action can be invalidated.  I'm curious as to where to draw the line as to what can interrupt and what can be invalidated.Immediate reactions, immediate interrupts, and opportunity attacks have the potential to interrupt things.  First issue is immediate reactions, which act in response to a trigger.  It's clearly stated that the trigger can be part of a move (i.e. at least one square), so immediate reactions can potentially interrupt any action that contains movement.Can you trigger an immediate reaction on being hit and resolve the immediate reaction after the hit but before potential other hits within the same action (say, such as twin strike's first strike, or blade cascade's first strike)?Some interrupts explicitly say what they invalidate (such as combat superiority's stopping effect), but when they don't, the effects of the interrupt may still make continuing the original action impossible.  At least, it may make continuing the original action as originally planned impossible. How much can you change your mind during an action is unclear:Can you attack someone else with a basic attack if an interrupt suddenly makes your original target invalid?  If you use twin strike, can you choose your second target with knowledge of the results of the first?  If you blade cascade, can you choose the next target with knowledge of the results of the previous hit?  If your path becomes blocked during movement, can you choose another path (and would this disrupt a charge)?  If a fighter interrupts someone who's shifting away and pushes them with a shield pushing combat challenge, can his target change his mind about where he shifts, or is his shift lost? The issue is really that it's not clear to me how much of an action you must declare and/or resolve before determining whether to interrupt, and once interrupted, how much of an unperformed action can still be changed (obviously you can't simply change the past).</blockquote>

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