That's true. Pretty much anytime there is friction there is heat. I'm just saying with a sharpener like we're using, there is ample time in between strokes for the metal to cool. And when I tried using the thermal gun to get a view of how much heat. blue being cool and red being hot, even with a hard fast stroke it momentarily changed to a slightly lighter shade of blue and that was while the stone was still moving on the metal. Even with a Wicked Edge being used by a highly coordinated individual on crack for an extended period of time,it might get warm to the touch, but no where near enough to mess with the temper.Hell, said individual would have more teeth falling out b4 that knife would get hot.