I have been staring at the rules for a while now, and I believe the system is actually fairly simple. I have looked over the rules many times and the following solution does not conflict with either the core rulebook or the FAQ:

- Declaring a move action adds movement points to your movement pool
- Declaring an action, including a second move action, can be done in the middle of a move action. However, declaring a second move action simply adds additional points to your movement pool, it does NOT cause your character to be replaced on the board (this prevents expanding and shrinking)
- Trip wire removes all movement points (so preemptively declaring a second move action is dangerous, due to tripwire emptying your current movement pool)
- Pit trap stuns you if you have no movement points left (so NOT preemptively declaring a move action is dangerous, because pit trap can stun you on your last space that you move)
- Pit trap's stun occurs immediately (you do not have a chance to add movement points to your pool)
- Fatigue grants 1 movement, but it is immediately consumed upon entering a space. The player should use 1 fatigue at a time, rather than saying "I use 4 fatigue to add 4 to my movement". If fatigue is used while your current movement point pool is empty, then your movement pool will continue to be empty after each fatigue movement (because fatigue is spent 1 at a time).

Example of last rule:

Start of turn: I have zero points in my movement pool
--> I use a fatigue and now have 1 movement
--> I move one space and now have zero movement (and can therefore be stunned by pit trap)
--> I use another fatigue and gain another movement
--> I move one space and I am sitting at zero movement again (and can be stunned by pit trap again)

As you can see, this interpretation makes moving via fatigue very dangerous without any points in your movement pool.

Feel free to use these rules in your game; these are the rules I will be using.

S2Shade said:

I am not sure if you are making a house rule, but this does conflict with the rulebook. On page 16 it says under the Large Monsters area, "When the monster ends (or interrupts) its movement, the overlord player places the large monster figure so that one of the spaces its base occupies includes the space where the monster ended its movement."

Philodept said:

Yes, but the FAQ says the following:

"When a figure performs a move action, that figure receives a number of movement points equal to his Speed. A figure can interrupt its move action to perform an additional move action, which gives that figure additional movement points. There is no need to differentiate the two move actions because they are both move actions."

You do NOT differentiate the second move action from the first, you simply add the movement points.