Although Tong Wan was a hypnotist, she had just emerged from a vegetative state. Her body and mind were severely weakened, and her hypnosis abilities were greatly diminished. She was far less proficient than Tally, whom Gu Yang had encountered before.
It could be said that Tong Wan's level of hypnosis was only a fraction of Tally's, sufficient to influence an ordinary person like Ruan Xueling.
However, Tong Wan couldn't sustain it for long.
Gu Yang surmised that Tong Wan had likely used hypnosis to control the nurse before escaping from the ward. But given her current weakened state, continuing to rely on hypnosis would only drain her mental strength further and hinder her recovery.
Now that Tong Wan was in a mentally unstable state, Gu Yang wasn't certain if she would respond to rational conversation. Thus, she opted to provide a subtle psychological suggestion, advising Tong Wan not to wander and refrain from using hypnosis until she was discharged.