| Well, this seems easy to me. If you are forced into forced into dangerous terrain (pit/lava/etc) you get an immediate saving throw and the result is your gaining the prone condition. If it happened again, the same thing happens again. It's just that prone doesn't stack meaning you are still prone.
Think of an attack that can cause slow. Would you say that I couldn't use that attack if the person is already slowed? A person can continue to gain the same condition over and over again.
Bottom line it never states that you can't have that you some conditions make it so you can't make the save. Unconcious, dying, prone etc doesn't stop you from making the save because there aren't any conditions in the PHB other than you need to be forced into dangerous terrain. |