Loki's eyes widened in surprised bit before he could think he felt his chin being squeezed and knew he needed to get free and fast. He never thought it before but he lifted his legs and sprung his feet toward Finn with what force he could muster as he swung toward him as well. With this he was aiming to push the man far away from him and crashing into the wall or cell bars. Either way he was aiming to knock the man out with the force his kick caused. 

If this was to succeed, Loki then went to stop himself from swinging and stood on his tip toes, moving his hands the best he could, he had them touching his bindings. Concentrating what power he had left, the sorcerer tried to freeze his bindings till he felt then weakening. After this process, Loki then yanked on them, using his body's weight to shatter the completely frozen bindings. With a loud thud, Loki felt the pain of his body's injuries get to him as he landed on many of them that he endured. With a gasp for the injuries were making him feel so much pain, Loki rolled over and curled up it hurt so much. But his instincts of escaping was overpowering now for he snapped back to the matter at hand. His freedom. Bringing himself to stand, Loki looked to Finn as he had seemed to have the keyes to his cell. In order to bit himself some time he needed to lock him in his cell. So taking the keyes Loki grabbed them and stumbled out, shutting and locking the cell hopefully before the man woke up and come after him before the far had managed to grab him.