Progress I believe!
The movement rule says determine how far the model will be moving. Disengaging strikes offers the possibility that the model will be moving 0" as they are resolved before the model moves. Resolving it is part of determining how far the model will be moving by definition.
I think I get what you're going for.
I'd state it like this: by my reasoning it is impossible to kill a model before the pre-determined end of the move, as anything before that would not be ending the move as close as possible unless something impossible to foresee happens. That in no way implies that it is impossible to kill a model with lure. A model on a Ht 15 unclimbable cliff will jump to it's death, because the base of the cliff is the closest possible point the model can reach with it's move before the move is ended. That is determinable. You can look at the board and determine that. The pre-determined end of the move is at the base of the cliff because it is the closest possible ending point to the Belle. By that same reasoning, a 6 wd, 5 wk model on a Ht 7 tower will climb down 2", fall the remaining 5" and take 5 wounds, but then move the last remaining 1" closer to the Belle because just taking a suicidal jump off would only get you to the base of the tower, and therefore climbing and falling gets you 1" closer. A 3 wd model will try to make it through hazardous terrain because it is _impossible_ to know if the damage flip will kill it and it is otherwise the shortest route that gets it closest to the Belle. If it dies before hand, you still took the shortest route to get you the closest to the Belle that was possible, because it was impossible to know a crazy flip would kill you.