Black Hand,
You mean in the handle? Your hand fits in there like a glove with no slipping. It is just a shape thing. If you are doing a big knife a swell really helps with the grip. This is a big knife I would use for hunting hogs at night. Bow has a red light for night time hunting...legal in SC.
When you forge out a lot of knives, you get tired of the same old shapes. When I'm forging, I don't know what I'm going to come up with. When I have to repeat a series of the same knife, I hate it. I just sent out three hunting knives for a father and his two son...all the same. It drove me nuts to finish that project. That's why I'm having so much fun forging and finishing a new style of knife...