If you have some ability to fly up to an altitude of 100ft, but come crashing down if you exceed 100ft, and another effect allows you to fly 50ft higher than usual, clearly the meaning is that you do not come crashing down until your altitude exceeds the new ceiling.
I have no idea how clear that kind of rule that would be, until we have a rule to look at. We have lots of movement rules already, so I am not sure how productive it would be to make up a new hypothetical rule and then use that hypothetical to prove something concerning an actual rule. Why not focus on the actual rule in this case?
Similarly, if a slowed creature has moved 2 or more square, it must stop. Implicitly, this is because it's used up it's movement for that round. In other words, the rule about stopping if you've moved 2 squares by plain logic becomes a rule that forces you to stop after 4 squares if you can move twice your speed.
I disagree. Cust Serv was aware of the interaction with the Run rules when they tried to answer the question (I can post that part if you want - they had accidentally misread my question), and they still felt that a readied slow effect that hits halts your movement after 2 squares, period. It seems to be an aspect of the Slow effect, and not of your movement for that round or speed.
To argue otherwise is to suggest that the two separate instances of the number '2' are unrelated and not to be conflated in the rules on page 277.
Correct. Apparently they are not related. They wanted a fixed point to make you stop, regardless of your speed or movement or speed+bonus from things like run. It's easier to adjudicate that way, and a lot of 4e sides with "easier to adjudicate" over other issues.
That's not how I read it, and I doubt that's how others do.
Even those who disagree with my view in general on this issue seem to agree with the part that you stop after moving 2, regardless of other factors. As far as I am aware, you are the first to say that "stop moving if you have already moved 2 or more squares" means "stop moving if you have already moved [your speed+bonuses] or more squares. "
If you really want to read the rules to a ridiculously literal level, realize that the rule only requires you to stop if you have already moved 2 or more squares. But what if you're crossing difficult terrain? Apparently you get to move 2 squares regardless of terrain... Or what if you're falling? Whew, lucky you, you stop after falling the first two squares.
I do not find it ridiculous, nor overly literal. I think they made that the rule for ease of play.
In addition to the fact that the rules for slow clearly only stop you after 2 squares since your new speed is 2 (thus clarifying that if you declare 6 squares of movement but are slowed half-way, you new speed kicks in immediately irrespective of your original intent), you'd also be permitted to take a second move action despite the double move rule. The actual rules block on double move does not force you to use it.
Yes, it does. If you make two consecutive moves, you have made (or attempted) a double move. Hyp just quoted that language. It does seem to force you.
Furthermore, it clearly does not consider (and thus does not apply to) interrupted moves. As a general principle, moves in D&D seem to be resolved square-by-square, and it is thus not necessary (nor for that matter possible) to fix in stone your movement more than a square in advance. This is not stated in the rules in such a form, but CS has confirmed it, and assuming the contrary leads to weirdness in the event of interrupted moves due to OA's and readied actions, to say nothing of the many immediate reactions and interrupts.
Actually, as I posted in the original post, Customer Service answered with a "huh, good question, we do not know, it's up to your DM until our rules guy decides to make it into a FAQ or Errata or other official item". So yes, it seems the rules folks did not consider it, but it's not at all clear how the situation should be handled (if it were, I think they would have answered the question).
So you can both resume a stopped move by moving again (see for instance combat superiority) since you are not forced to use the double move action, and further, when slowed you need to stop after moving 2 squares by reason that that is your speed, and thus anything affecting that reason affects the conclusion.
I disagree on both points. It says you must use the double move if you do two moves in a row, stopping would by definition eliminate the benefits of a double move (it says so in the double move text - it's why you can bypass some difficult terrain and have the first move "end" in an occupied square, because you do not actually stop), and it is not based on your speed or speed + bonuses (CS already knew of the Run rules interaction and still rules you stop after 2 squares).