Lol. Ok but that still means Katsumi's powers are in play.. 
Katsumi is not using some kind of energy, he is using a sword. At most you could paralyze him.. so then how do you shut his powers down? That all depends on the deal you make with the demon in the sword.. but it is a high ranking fiend so the cost is going to be horrifying. I recommend you don't adrees or mess with the demon.. at very least you will die for being cocky enough to adress it in it's perspective.
Blocking out powers is one thing, dabling with demons is another... though it is ok if your character thinks it can shut my powers down. I want to see what will happen. Lol. So as you can see, I'm horribly evil... ^_^