User blog:Marco the Marine Admiral/Theory: Evilness Can Lead to Power-up for Dragon Slayers

Among the 7 dragon slayers, 4 could activate DF by will.

The last time Laxus activated DF is in the FF arc. He hasn't activated it ever since.

The last time Cobra activated DF is in the OS arc. He hasn't activated it ever since.

The last time sting and Rogue activated DF is in the 5th day of GMG arc. They haven't activated it ever since.

A regular pattern. All those 4 dragon slayers can only activate DF by will when they were antagonists. None of them have shown that feat again when they act as protagonists.

I often wonder why none of those dragon slayers activate DF when facing the real dragons. Now it can be explained.

What do you think?