What should a rescuer avoid doing while managing a diver in distress?

In managing a diver in distress, the correct approach involves maintaining the diver's safety and comfort while preventing further complications. Allowing the diver to sit up can pose risks, primarily because it may increase the possibility of aspiration if they are experiencing difficulty or panic and might also exacerbate any potential injuries they have sustained. Keeping them in a more stable position, typically lying back or floating, is generally safer as it helps in managing their airway and maintaining buoyancy.

In contrast, keeping the diver calm is crucial as it assists in reducing anxiety and preventing panic, which can worsen their situation. Monitoring vital signs is also essential to assess the diver's condition and respond appropriately. Excessive reassurance, though often well-meaning, can sometimes lead to further confusion or panic if the diver does not feel adequately supported by the rescuer's confidence. Thus, the focus should always be on maintaining safety and control, which is compromised by allowing the individual to sit up in distress.