I agree with George on all points, I noticed is that their bevels don't seem to be as extreme as the one you showed. I would almost suspect they are doing a "blending" after they put in their primary bevels with the slack part of the grinder... I haven't tried that but I think it would work. Like George said, experiment around a bit... and let me know how it turns out, cause I see some of that style in my future projects...