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The basics: Moving away from a threatened square provokes an Opportunity Action.

The wrinkles:

  • Certain forms of voluntary movement (shifts, teleports) specifically do not provoke OAs.
  • Being pushed, pulled, or slid by someone else's power (forced movement) also do not provoke OAs.

The question:

  • What if the movement is involuntary, but not forced by another PC or NPC? For instance, falling due to failing (or skipping) an athletics/acrobatics check, being swept away by the current, or other terrain hazard?
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A good rule of thumb is that all OA's can be avoided. If someone provokes an OA, they did so by their own choice. – dpatchery Jun 22 '11 at 16:54
While the rules say it doesn't provoke an Opportunity Attack, there's nothing preventing a house rule. Personally, I think think it (situationally) makes sense. Falling? Probably not. Pushed past a monster? Probably. Pulled away from a monster? Probably not. – corsiKa Jun 23 '11 at 15:05
up vote 6 down vote accepted

Re: Falling: Does a falling creature provoke Opportunity Attacks on the way down?

Based on this, and the lack of OoAs on forced movement, I would assume that other terrain-based forced movement would not provoke OoAs either.

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