Ernesto apparently misinterprets this comment as a taunt, because before Priscilla sees it coming, he back-hands her across the face. The impact turns her head toward one of the cameras, where we can see an expression of silent rage.
Ernesto: No. I want you to kill her.
Priscilla gathers herself and turns back to Ernesto.
Priscilla: I obey, per the terms of my summoning.
Without asking to be excused, Priscilla leaves the room. Ernesto, oblivious to the menace in Priscilla's tone, smiles.