User blog comment:B214/Chapter 482 review/@comment-27281341-20160418130317/@comment-7418318-20160418131147

Maybe there is some kind of downside to using Devil Slayer Magic and that's why he uses it only as a last resort.

We know that he had some real troubles with it, but thanks to Porlyuscia he got it under control somehow, but maybe this solution isn't absolute and could deteriorate if he overuses those powers.