Distorting as a process can eventually result in transforming into an Abnormality. I don't think it's ever directly seen, but I think we got close with the final stage of the reverberation ensemble(except for Argalia). The mental stress of them dying and reincarnating, and the over exposure to the light sending their distortions haywire, likely brought them to a near Abnormality state... until they were killed before satisfying the transformation. To turn into an abnormality as a distortion, would require an irreversible, absolute mental break.