Records of people walking on fire have existed for thousands of years. Walking acrosshot coals without getting burned does seem impossible, especially when the coals are at a temperature of 1500 K. However, as long as they do not take too long to walk across the coals, firewalkers won’t get burned.
The explanation may have something to do with the relatively small amount of thermal
energy involved. Although the coals are hot, the total amount of thermal energy
transferred to the soles of the walker’s feet is small. This is a little like quenching a redhot metal bar in a trough of cold water. The metal bar cools rapidly, transferring thermal energy to the water, but the rise in temperature of the water is quite small because of the relatively large value for the specific heat capacity of the water.