Elethiomel said:
AoOs from involuntary movement opens a very large can of worms when you introduce dynamic battlefields.
It been subject to some discussion:
Involuntary movement from bullrush causes AoO's, but there are others (Gust of Wind or Telekinesis-Violent Thrust) that don't say, or even specify that they don't provoke (improved grab, Knockback feat from Races of Stone)
I've noticed a precedence for involuntary movement (like falling, stalling, etc.) provoking AoO's. This was the ruling from the Sage in a recent Dragon magazine (however, the last few editions were never added to the FAQ). Also, you can provoke AoO's from involuntary movement if your mount panics (mentioned
here).
While I'm not completely sure I like that, the alternative is allowing players to use involuntary movement producing effects to say, get themselves out of (or into) a threatened area without provoking.
By
strict interpretation it seems that all movements would provoke AoO's as normal (as stated in the global AoO rule), unless they specifically say they don't.
But either interpretation seems valid to me. And I agree with you statement: this would be a hassle in a dynamic battlefield that moved on it's own.