Cutting your way out of a monster after being swallowed requires dealing damage equal to 1/10th of the monster's HP. Does healing or temporary hitpoints interact with that at all?
I can think up a couple of possible interpretations... Which would you go with?
a) Temporary hitpoints must be removed before counting damage required to escape. If the monster gets an opportunity to gain temporary hitpoints or heal lost actual hitpoints before the damage reaches the 1/10th threshold, that healing counteracts the damage done to escape.
b) Temporary hitpoints are treated the same as actual hitpoints - add temporary and actual hitpoints together before calculating the damage required to escape (at the time of swallowing? Seems iffy with pools of temporary HP that have durations measured in rounds). If the monster gets an opportunity to gain temporary hitpoints or heal lost actual hitpoints before the damage reaches the 1/10th threshold, that healing counteracts the damage done to escape.
c) Temporary hitpoints are disregarded when calculating the damage required to escape. If the monster gets an opportunity heal lost actual hitpoints before the damage reaches the 1/10th threshold, that healing counteracts the damage done to escape. Gaining temporary hitpoints does not counteract any damage done to escape.
d) Temporary hitpoints are disregarded when calculating the damage required to escape. Gaining temporary hitpoints or healing lost actual hitpoints after swallowing does not affect the damage required to escape.
e) None of the above?
C... Kinda.
Temporary hit points are like a buffer and are not considered part of maximum hit point total. They will instead be taken away first before other damage is applied.
Think of temp hp as 'body armor'.
Healing takes away preexisting damage and subtracts from the damage threshold 'reseting' those hit points.
If you get a cut and the cut heals, do you still have the cut?
You heal all types of damage when healed, so if you have 10 points of non-lethal, 10 points of lethal, and your 10hp stomach got cut open, 10 points of healing would remove all of that.
Personally, I would assume that temp hitpoints are always spent first, meaning if you get 10 temp hp, it doesn't matter what the source of the damage is, you burn through the temp first. But I also don't have anything to go off of besides the fact that you always remove temp hp first when you are attacked for normal damage, not a body part is attacked.