Lost Star, Area A9: Choking Sands

[Gabbers "Gab" McTalkington]

Just finished running The Lost Star, and one of the issues I ran into was in area A9, it was unclear how to treat the 10 feet of swirling sand. The Effect targets "a creature that starts its turn in the area" ... but the person who triggers the trap by walking through it doesn't start their turn there. Nothing in the Effect description indicates that their movement is stopped by the assault, nor exactly how to treat the 10 feet of swirling sands within the corridor.

I handled it this way: The person who triggered the trap had to stop and make the save, taking damage for a fail. Anyone else who entered the area, even if they had the movement to clear it, also had to make the save once while in the sand-filled area. And the area with sand was treated as Difficult Terrain for movement purposes.

[DerNils]

I made the sand just tricky to look through. In one run through I had the guy Standing in front of the statue do a Survival check DC 10 to move in the direction he was planning to. Beyond that, if you could move through the sand, you could move through. It's dangerous enough with the Door to A10 being jammed so you have to stop in the effect.
I don't think you need to make this any Harder.