User blog comment:Wyvern 0m3g4/WYVERN WANTS YOU!/@comment-1949750-20120416185742/@comment-4080028-20120416190711

Ah, then i'll try my best at explaining myself here.

You see, the DF's main power is to shave things, right? So on the literal, physical side, No Beard can shave the bark off of trees, or shave layers off of rocks, among many other things.

But, I remembered that Kuma's Paw Paw Fruit was capable of rejecting abstract concepts as well, such as when he removed Luffy's fatigue from the fight with Oars & Moria. So I thought it would be a good idea to apply that to the Jori Jori no Mi as well.

As a result, No Beard can shave away abstract concepts, and by association, a person's power(s.) In this case, a user's DF power. In much the same fashion that he can shave away the stability from a house to make it collapse, or to cause a cliff to create a rockslide, he can shave away fatigue, in order to re-energize his allies; and then of course, I was sort of hoping that he could also shave away my protagonist's DF during their climactic battle, which I thought would have made for a much more interesting story. (Of course though, he gets it back at the end, but I digress.)