Thankfully, the silence isn't noticed. Strange's mind is simultaneously everywhere and here, he pays no attention to Childermass not really saying anything because he's thinking of something else.

"She must have an astonishing amount of power. To move the carnival as well as grant our contracts?" Strange shook his head slightly, still marveling and still thinking about just what sort of a faerie the Ringmaster actually was and what her limits (if she had any to begin with) were.

He really needed to take better notes.