These scenes are only clearly seen by clinical medical staff,
therefore the doctor dares not say that the students and teachers at your school made a mistake. Students and teachers at school do not have medical knowledge and cannot diagnose accurately like doctors, nor can they determine if the patient's condition requires waiting for an ambulance.
The general public needs to understand that an ambulance is not omnipotent; an ambulance is not a surgery room, and the emergency items and drugs it can carry are extremely limited. The reason modern medicine can save more lives is positively correlated with the development of tools that assist doctors in saving lives. The more magical tools doctors have, the more lives they can save.
"Wasn't he just alive? When we arrived, I could hear sounds coming from his throat." The female teacher can't believe it and asks the doctor again.