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I truly believe that the AoO on a prone person trying to stand up happens BEFORE the person trys to stand up. I believe this is the reason a trip lock is not possible. I believe that is the point of both the 3.5 and Paizo FAQ's on the matter.
If this is the case, then what provoked the AoO? What did the prone target do to provoke the AoO? Apparently nothing since it was before he tried to stand up. Does this really make sense to you?
The mainstream interpretation (and I'm going to boldly say, the correct one) is that the prone target starts to move in a way that provokes the AoO. Now we get into a situation in which they must be resolved in a particular order. That doesn't mean they fully occur in that order - since the triggering move action starts before the AoO (otherwise no AoO could be provoked) and finishes after - just that they are resolved in that order. And if the AoO's result makes the rest of the move invalid, bye bye move action. If it does not, the move action continues to its resolution.