Quote Originally Posted by nonsensei View Post
That's most likely DoT (Damage over Time), so stuff like poison, drown.
The main reason to avoid it is that it increases the time taken by animations which hinders the so-called para train which is basically spamming paralyzing abilities to prevent the boss from doing whatsoever. A pretty common thing for Union Events at DMM competitive unions.
I thought it was because DoT damage doesn't count towards PP, reducing your overall PP gain as well as your allies.