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OK I hope this doesn't violate any copyright rules, but I don't see any way to get 'round it and still ask my question, so here goes:
4th ed rules state: "the unit moves at the speed of the slowest model."
Now this is pretty easy to grasp with mixed units, but what about non-mixed units that that are PARTIALLY moving through diff. terrain? (half the unit is, half isn't, or one is rest aren't, etc.) Does the entire unit HAVE to move at the speed of the one(s) in DT?
I usually play it that any model can move its maximum distance, as long as the unit remains in coherency. Meaning, if you had half a unit in terrain, half the unit out, the ones outside of the terrain could use thier full move, as long as the unit was still in coherency at the end of the movement phase.
You cannot win, for to fight us is to give us power.
Thats what I would assume too, the models in difficult terrain move slowly while the others don't but they must maintain unit coherency. Effectively they would be moving just as slow to keep together most of the time.
The rules state that the distance rolled is how far the unit moves, hence the entire unit must move the same speed. If even one model can only move four inches because of the dice rolled for difficult terrain, then the entire unit can only move four inches.
Every whisper of the future from the Warp speaks of a hundred battles lost, a thousand lives devoured and a million enemies born. -- Inquisitor Lord Babel
Unfortunately Babel_Matrix is correct. GW has made this a game of units not individuals, so if even one member enters rough terrain then the entire unit must move at the speed you roll for rough terrrain. As you pointed out, the unit must move at the speed of the slowest member, even though your method seems more logical. Think of the unit as if it was a unit of warhammer fantasy troops, just not locked into formation in a movement tray. You can't have one troop move differently than the others, it would break up the formation (in fantasy). In 40k they still act like a single unit.
I always thought it would also make sense that the single heavy weapon guy could sit still and other squad members could move around him (in coherency) to get better shots, spread out, etc. The heavy weapon guy didn't move so he should be able to shoot. But if one moves they all "moved".