I attended a couple Unleash the Power Within events and I crewed a few as well. I loved the Firewalk. I have walked on fire barefoot twice.
We have 2 lists in our head. Things we can do and things we cannot do. The firewalk reminds you to take an active role in creating those lists in your head.
Here's a pic of the fire team getting the fire hot so 12,000 people could walk the firewalk that day. Barefoot on red hot coals! Amazing day assisting so many people conquer their fears. So blessed to be a part of the process.