Why does she knows so much

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" I did not think that she would bury a weapon in the ground," Mo Xifeng was really ashamed. She was thinking that she had to be the one who had to protect her elder sister, turns out that it was her sister who had to protect her. Just the very thought of relying on her sister who was not even a knight made, Mo Xifeng a bit embarrassed. 

" Of course, there will be weapons hiding inside the cave! Xifeng, are you really certain that you are a knight in training? Can't you see that the cave looks shady? Even if you do not know that something was inside you should still look inside properly! How can you think that there might be no trap in places like these?" Mo Qiang questioned as she looked at Mo Xifeng, her expression was filled with disgust as if she was looking at a dimwit. " You are the kind of woman who barges inside a haunted house even when it says caution ten deaths and one mutilation, right?"