Unfortunately, the Flowsaber is going to require some modification in order to be safe to spin. Good news, there's a quick and easy fix. ... https://www.youtube.com/watch?v=6Oljx5pRMjY
Here's an up close and Lit version of the Firehand proof of superpowers. That's 11 inches of kevlar burning White Gas at 1110-1400 degrees. That's Hot. :)