I'm... pretty sure it's just their Noble Phantasm lines.
One voice reminds him of his war and the other reminds him off the time he really made some either fucked up or stupid decisions including the reason why the other one absolutely hates him
His reactions pretty warranted all things considered
Outrage Amazon!!
(A Hero to Die by My Rage)Clarent Blood Arthur!!
(Rebellion Against My Beautiful Father)This is the cursed sword that destroyed my father.Uwaa, aaaAAAAA!
ACHILLEEESSSSS!Kill... Kill!!...KillAah...