Firewalking is no mystery and certainly not anything supernatural:
http://en.wikipedia.org/wiki/Firewalking"When two bodies of different temperatures meet, the hotter body will cool off, and the cooler body will heat up, until they are separated or until they meet at a temperature in between.[15] What that temperature is, and how quickly it is reached, depends on the thermodynamic properties of the two bodies. The important properties are temperature, density, specific heat capacity, and thermal conductivity.
The square root of the product of thermal conductivity, density, and specific heat capacity is called thermal effusivity, and tells how much heat energy the body absorbs or releases in a certain amount of time per unit area when its surface is at a certain temperature. Since the heat taken in by the cooler body must be the same as the heat given by the hotter one, the surface temperature must lie closer to the temperature of the body with the greater thermal effusivity. The bodies in question here are human feet (which mainly consist of water) and burning coals.
Due to these properties, David Willey, professor of physics with the University of Pittsburgh, says he believes firewalking is explainable in terms of basic physics and is not supernatural nor paranormal.[16] Willey notes that most fire-walks occur on coals that measure about 1,000 degrees Fahrenheit (550 degrees Celsius), but he once recorded someone walking on 1,800-degree (1,000 °C) coals.[3]
Additionally, Jearl Walker has postulated that walking over hot coals with wet feet may insulate the feet due to the Leidenfrost effect.[17]
Factors that prevent burning
Water has a very high specific heat capacity (4.184 J g−1 K−1), whereas embers have a very low one. Therefore the foot's temperature tends to change less than the coal's.
Water also has a high thermal conductivity, and on top of that, the rich blood flow in the foot will carry away the heat and spread it. On the other hand, embers have a poor thermal conductivity, so the hotter body consists only of the parts of the embers which are close to the foot.
When the embers cool down, their temperature sinks below the flash point, so they stop burning, and no new heat is generated.
Firewalkers do not spend very much time on the embers, and they keep moving."
http://www.pitt.edu/~dwilley/Fire/FireTxt/fire.html"It would seem then, that a firewalk of short length is something any physically fit person could do and that it does not need a particular state of mind. Rather, it is the short time of contact and the low thermal capacity and conductivity of the coals that is important, and it is not necessary for the feet to be moist nor callused, although either may be of slight benefit. Longer walks appear to be possible if a layer of insulating ash is allowed to build up on a well packed down bed, where the temperature has been allowed to fall significantly from what it was when the coals were at their hottest.
This is not to deny that one may feel empowered by having walked on fire, nor is it to dispute that it may improve self confidence. I do however believe that firewalking is understandable in terms of basic Physics and is not supernatural nor paranormal."
My $.02.
But really, are there people that actually believe that?