Sabine's expression doesn't change any for the level of the fallen angel's expression and seriousness, nor uncertainty toward his motives behind it. She's been poised on the spot where a world was always already trying to crack and sweep under entirely for her whole life (existence), but party to its dedicated warding and rebellious turncoat from what was supposedly (a r g u a b l y) the greater portion of her duty.

Her world has always been on that hinge for millennia uncounted, save by a seldom few.
The potential, without the promised certainty of the problem, doesn't an emergency make.

"And if so, how would you plan to stop them while trapped in your gilded cage?"