Thank you!

Cool, he seems to be as big a master of heat treatment as Paul Bos.

As for the video, these slag blocks are very fragile,
Most knives made of low-carbon steel will destroyed
this block, but how about keeping the edge
and flexural strength?

My friend several years ago conducted complex tests
for strength, unfortunately, these are not laboratory
tests with the possibility of repetition of loads
https://www.youtube.com/watch?v=yB2cEyNPQDc

He made only one mistake in my opinion - he used
a steel hammer. Then he switched to rubber hammers.

You're right, I wear CS Espada in my backpack.
Constantly with myself in pocket I wear Emerson CQC8
with 3.5" blade