The girls were beaten to the point of desperately searching for their teeth.
Searching for their teeth is just a figure of speech, it doesn't mean that everyone really lost their teeth... but they were indeed beaten quite miserably.
Even Zhao Yuanzhen, who had rich combat experience, could not gain the upper hand against Yan Yu in a pure Sword Control Technique fight, with her cultivation not fully recovered and not allowed to use any unorthodox, toxic magic.
In order to practice defensive Sword Control Technique, Yan Yu's attack moves were designed to be quite simple, the first strike would always be a slash that you could see coming and block with a horizontal sword strike.
