Not sure which trap area you are talking about, possibly the crypt. There is a way to deactivate everything all at once to avoid getting burned, also when you trigger the trap the normal way the game automatically pauses for you for "reaction"...also there is a rain spell that can negate a ton of fire effects or water jugs you can throw at your characters or on the ground, also you can "help" an ally to put out fire if I remember correctly.
Tons of solutions to not get burned as well as negate the burn if it happens.
