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Message: <blockquote data-quote="kerbarian" data-source="post: 4994449" data-attributes="member: 40393">As far as I can tell, this isn't directly addressed in the rules.  In general, I'd go with the idea that whenever the situation changes, characters and monsters can make new decisions based on that, as long as it doesn't retroactively change their previous decisions.  Deciding to stop an action is okay, but deciding to back up and do something else instead isn't.If your original action becomes impossible to complete (like in your example 1a), it gets fuzzier, but I'd allow whatever portion of the action is still possible to be continued.By those guidelines, the answer would be 4.  M can either continue charging T (taking an OA from F) or stop and end its action.For the examples in 1a:If T moves out of charge range, M can use the rest of its movement attempting to "move directly to the nearest square from which you can attack the enemy" but will fall short and not get to make an attack at the end of its charge.If T casts a Wall of Ice, M can again use the rest of its movement continuing the charge but will have to stop when (or before) it runs into the wall.</blockquote>