See it in use here at 13:20:
It's a $7k blade. One guy cuts, the other two hold the two sides of the tuna. It sounds like he is saying it's chisel ground, to get the cleanest cut. They sharpen it once a week.
Current folders: Chaparral FRN, Native 5 Salt SE, Native 5 Maxamet, Native 5 S90V, Stretch 2 V-Toku2, Endura ZDP-189, Native Chief S30V, Manix XL M4, Police 4 HAP-40
Current fixed blades: Jumpmaster 2, Street Beat FRN