Torahiko greets one of his squadmates, but otherwise stays an observer for now. He knows he's seen Caeyrn somewhere before too, wasn't he in that one movie? He was part of the ZHE? Maybe he was a look alike?
He lets go of the wheelchair and steps back after the doctor frees the "conscript" from their binds, partly for paranoia's sake, but mostly to keep out the spotlight. It wasn't that big a surprise when the occupant started moving. The scientist said something about it being one of those high-level hollows? Wasn't sklaverei one of the highest level powers for the quincies? And it's best use is apparently taming a monster that wasn't even a monster anymore? "So this is what the quincies are really capable of?"
The real surprise was that for a moment there, he had felt a glimmer of hollow energy from Demetrio, with the killing intent to match. Were the chains binding their mind weren't as tight as they could be? Or perhaps they just corrode without direct management on the quincies part? Either way, he makes a mental note to get further insight later.