The alchemist stink bomb says it creates a stinking cloud that lasts only one round.
So if a creature is inside the stink bomb cloud area and they make a fort save they don't become nauseated. The description says that if they choose to stay inside the cloud they have to roll again on the caster's turn.
But what if the cloud then fades just before the character's turn begins, as it only lasts for one round?
Does the creature that stays inside the cloud at the end of their turn avoid having to make that second save because the spell is no longer active during the caster's turn, and no longer counts because it finished?
I'm not a fan of this interpretation because it seems like they make one save and are free to breathe in the gas and don't have to leave it.
Or do they still have to also make the save on the caster's turn because they stayed inside the cloud?
This makes more sense to me because it punishes creatures that remain inside the stinking cloud through their turn. It would also be kind of meta to stay inside the cloud thinking you are immune to it because you know it only lasts for one round.
Edit: The summary of the question is "When do you make saves when a stink bomb hits you. The options that stand out as possibilities are: 1) when the stinking cloud appears around you on the casters turn; 2) the beginning of your turn when you stand in the cloud; 3) the end of the turn if you stay standing in the bomb; 4) the casters turn the round after it was cast.
"Living creatures in the cloud become nauseated," made it sound to me as if the moment the cloud appeared they had to make a fort save if they were in the cloud or moving into the cloud, hence why I thought they had to roll when first hit, 1).
However maybe 2) is the right choice. If they only have to fort save at the beginning of their turn, it would make spamming stink bombs (such as with a Mad Bomber build) not call for multiple fort saves in a single turn.
3) would make it so you have time to get out if hit by a stink bomb. Basically it turns the stink bomb into just a warning area. Get out or you will be nauseated.
4) I believe should always apply if they chose to stay inside the stinking clouds area, even if it ends in one round. However the argument against this is that the cloud spell ends before the casters turn even begins. Why should they have to roll on the casters turn if the cloud dissipated already? The spell warned them bad things would happen if they stayed in it, but the spell is gone now so doesn't count.