If she really saw that Xie Wanying's skills were lacking, Lu Xin would have helped the patient with oxygen long before Xie Wanying said it wasn't necessary. Clearly, Xie Wanying's judgment was correct. The patient's condition wasn't severe enough to require this.
Administering oxygen isn't inherently good. Unnecessarily forcing any medical treatment on a patient is redundant and harmful, affecting the patient's own physiological functions. Even low-flow oxygen should not be administered impulsively.
Similarly, if the patient isn't gasping for air to the point where they can't breathe, why cover their face with a plastic bag? Just as Xie Wanying said, helping the patient adjust their breathing rate is sufficient.
