Stumble Gap chain

[i208]

If I have two Stumble Gaps active adjacent to each other and my enemy fails the save in one, and falls into the second one, what happens? When they try to stand up do they have to save again while standing up? I hope yes obviously.

I want my Sorceror to utilize spells that aren't ever-present like grease and magic missile etc.

[CrazyGnomes]

As it doesn't specify that you get to choose where they stumble, I would assume that either (a) the enemy gets to choose which square they fall prone in or (b) it was determined randomly, via d8.

But assuming that they either chose to fall into the second one or randomly rolled that way, they would fall prone in the second one and nothing would happen. They're not stepping into it and likely to trip (again), they're just falling down on top of it.

And likewise, when they stand up, they are not stepping into the square, so no Reflex save.