An eye for an eye

secret transmission = a method of sending 

 "我还当你们有多强,"陆明舒道,"原来也不过如此."

"I thought that you were good, but it seems like I was wrong." Lu Mingshu smiled at Yin Hong thinly. 

 同样的话,她还了回去.

The exact same words that Yin Hing as said. 

 殷虹色变:"你怎么会..."

"Wait, how did you…." Yin Hong's face turned green. 

 "怎么会懂得应对?"陆明舒淡笑一声,手指轻弹月神剑,"你们以为别人见识浅薄,却不知是自己孤陋寡闻.再说,你们当我不知道,我那好继母不想让我活着出神女遗迹吗?"

"Know how to counter attack?" Lu Mingshu sneered, fiddling with her sword. "Do you think everyone is like you? A frog in the well? And isn't it so obvious that the last thing my stepmother wanted was for me to leave this place alive?" 

 大概以为陆明舒进了陷阱,就由他们摆布,方才两人对话,根本没有施展传音入密,是以她听得清清楚楚.