if you overheat it, two things happen:
the rhodents dont hold together and you get a mess when the python constricts them.
and
you lose some vitamins the BP absolutely needs. it needs to be raw, not cooked, especially the liver and other internal organs.
i would suggest using warm, not hot, water to thaw it and warm it to about the body temperature of a living rhodent, and then give it a short blast with a hair dryer.