Bull

A whole explanation including the history of the iron bull and diagram later, 

"That's a very interesting method, I don't think I have ever heard of something like that," Brianne said, a small smile coming on her face as her eyes showed nothing but mischief. 

"It sounds interesting enough though," Nickle said, narrowing his eyes at one of the other brothers. 

"Agreed." The man said, nodding a little too enthusiastically as the man in front of them started trembling but he is looking at them with an air of defiance that clearly tells just how much power this man held before.

But the others do not seem to care about just how intimidating he looks. They are all too busy discussing this thing Eclipse told them about. The Iron Bull thing which might not even be called that for all he knows.