Was that the prototype? It might well be.
One of the amazing things about Mick's grinding is that he can flip between hollow and flat grinds with ease. I don't know any other knifemaker who can do that like he does. I damn sure can't. He just decides which is best for what he wants to do and does it.
The funny thing about all this is that if you were to ask Mick and I an identical set of questions about the design, function and construction techniques required for a specific knife purpose, you'd likely get totally different answers. We each look at these things from completely different angles.