Duma waited patiently as Azrael tried to ascertain the meaning behind the hand motions. O! How much easier it would be to speak! But he just wasn't sure if he knew how anymore and even if he did, it would be breaking his vow. He lifted his eyebrows nodding along - yes, that sounded like something Satan would do. Still, it pleased him to know that this woman knew what Azrael was, who he was, and that she apparently wasn't taking advantage of his sweet brother.
Trust was not love but he didn't even bother finding a way to sign that. Honestly, there were so many things he wanted to say but he didn't have the gestures for them. When he had lived in Hell, it had been so much easier. Check in the soul, send it along its way, move on. No one talked about feelings much or relationships. The frustration showed on his face and the way he lifted his hands, in fists to press against his mouth.