Lan Wangji has never met Ragnelle and has no opinion on her. Also, it is probably wildly obvious which person at the mansion he trusts the least. Belaboring the point will do nothing useful in this moment; he is convinced that Luo Binghe is innocent of this particular violation. "That is why I spoke with Master Asmodean, in hopes that he would know of a third resident with dream manipulation powers."