If looks could kill, Wanda would've been a smear of gore upon the ground. Loki glared at Wanda, and had his hands been free, he might've pounded upon his cage to get at her. Instead, he simply stood perfectly still, responding to nothing she said. He hated her, hated them, for now Thor was in the picture. Even after she left, he remained fixed, knowing he was being observed. He would not reveal any weakness to his enemies, no matter what Wanda thought.
She thought herself so clever, but there was more to him that met the eye.
He would bide his time. There was little else to do, until he could make his break for freedom. Until then he would remain alert for any chance he could take.