"Ugh..." Loki let out a low groan of pain and turned to look at his right shoulder. The collarbone that had been nailed through hurt so badly his mind felt foggy, but he did not hesitate for even a moment before he started shouting, "Thor! Thor!!!!"
There was no sound, only his own shouts echoing through the dark cell. Loki did not stop. Gritting his teeth as he assessed the room, he kept shouting, "Thor!! Thor!!!"
He shouted for a full minute before finally hearing an extremely faint tapping sound. More accurately, it was a kind of vibration coming from behind him. If the iron ring had not currently been lodged in his collarbone, and if the chain had not been connected to the wall, making even the slightest tremor set off pain, he might not even have been able to feel that almost imperceptible vibration.
"Thor..." Loki lowered his voice. "You can't move? You can't speak? Why?"
The faint vibration continued. Loki's mind spun rapidly. "If you're in danger too, and doing this is taking a lot out of you, then stop moving!"
Sure enough, the tapping tremor stopped. Loki lowered his eyes. Thor was behind the wall at his back, and he was in danger.
The fact that he could tap meant at least part of his body was not restrained, and that he could touch this wall. But with Thor's personality, since he had heard Loki's voice, he would definitely respond with all his strength. Whether with his hands, feet, shoulders, or head, he would use every bit of strength he had to knock. No matter what, it would never be this weak.
And if the sound was this weak, either he had no strength left, or something was blocking it. And the moment Loki said not