Also, I feel like I need to veer into the construction of swords for a second: you're heating the blade. There's never any metal in contact with the hand, because metal has bad grip and would rust if you're holding it under sweaty layers all the time:

[img]https://southernswords.co.uk/media/catalog/product/cache/1/image/9df78eab33525d08d6e5fb8d27136e95/y/o/yoshimitsu3.jpg[/img]