He snaps his teeth, leaning forward a little, but it's not enough to pull against his bonds, not a complete loss of control. He doesn't move back again, though the position is uncomfortable, just stays there, eying Tony for a long moment.

"Where is my brother?" he demands. He knows -- in what passes for the sane part of his mind now, if nothing else -- that they won't let Thor see him while he's like this, but it never does stop him from asking.