This isn't a deaggro. It's a loss of claim. When the glitch happened, which is what it was, a glitch, the former party lost (most of) their hate and my 1 action made their mob begin attacking me, but they would still be affected by that mob's AoE.
That is called deaggro.

deaggro= all hate is lost. This in turn also causes declaim.
declaim= claim is lost, regardless of hate.

Also, i lol'd at the idea that dia is better than provoke for "stealing" claims. half second, vs instant, yasure.