Serrated knives have a purpose in few applications in my opinion. I've seen a couple different versions. One has a 'scalloped' edge, and the other looks to have a more pointy saw toothed edge between the longer points. Does that make sense?
I have a serrated knife (the scalloped version) for slicing bread. The serrations go from the back to almost the point. The point is blunt at the nose to about 1/2" back and is blunt on the bottom at that point. It's like a gutting knife for game animals. It's not really hook shaped, but the idea is the same.
You get the cutting edge for the most part, but at the end, the blunt portion makes it impossible for the serrated portion to contact the surface unless you really try to do so.