# Does a proning opportunity attack end movement in the square a creature was moving from?

For the party I DM for, one of the Minotaur players has an nearly absurd (judgement call) feat called Opportunity Gore. Opportunity Gore lets a Minotaur use his racial power Goring Charge over and over again as an opportunity attack.

When Goring Charge hits, it knocks the target prone. So this leads to a slew of questions about how proning affects a creature in mid-movement. I think there are some rules for this situation but I can't remember where they are.

The primary question is: Does an opportunity proning immediately end movement and the move action in the triggering start square?

If not, what would happen?

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This isn't actually all that over-powered. That feat is one of the few strong points of the minotaur race (which is otherwise underpowered), and while prone on OAs isn't easy to come by, slow is (and is almost as good). – Oblivious Sage Aug 18 '12 at 23:51
Good point, your probably right about that. I think I just resent the feat because it's caught me off guard a few times. – Mark Rogers Aug 19 '12 at 0:41
just wait until he is slowing, pushing and proning on his OA :) – wax eagle Aug 19 '12 at 2:53
@waxeagle: Heck, by epic tier fighters can daze on OAs with the right feats. – Oblivious Sage Aug 19 '12 at 14:52