What I find wonderfully ironic is that the "positive thinking" that was supposed to protect them from the fire probably increased the harm. As your link points

What I find wonderfully ironic is that the "positive thinking" that was supposed to protect them from the fire probably increased the harm. As your link points out, the sweat on the bottom of the feet protects the firewalker from the hot coals. But, where does that sweat come from? In large part, it comes from being nervous. The positive thinking that Mr. Robbins encouraged could very well have reduced that nervousness, eroding the protection that his students had on their feet.