She heard the roar and didn't recognize it, which meant Logan didn't know yet. Closing her eyes briefly she tried to find him. Logan, they have some of the children and are retreating. They took Julian and Laura as well.
Turning she saw James and knew anger had taken over instead of thought. Piotr was trying to reason with him but she wasnt' sure reasoning would work. "They are retreating! If you kill them it will be that much harder to find out who they are and where the children they took went! Alive! We need them alive!" If nothing else at least that should cause him to stagger in thought and perhaps not kill any.