"It depends on the amount of air that enters and whether it enters the artery or the vein,"
"If air enters the artery, it may cause air embolism, blocking the peripheral vessels of the fingers, affecting your hand function. If it enters from the vein, the bubbles could reach the heart and possibly trigger acute heart failure, leading to organ ischemia. If it enters the pulmonary artery or cerebral artery, it could cause pulmonary embolism or cerebral embolism."
"There was once a male patient in his thirties who injected himself with 300 milliliters of air through an acupuncture point and fainted on the spot. Although he was sent to the hospital in time and his life was saved, his lungs suffered irreversible damage."
The more Li Shi researched, the more he felt that if he ever encountered a situation where he needed to take drastic action in the future, using "air" would be the most covert method.