Originally Posted by Dirk Diggler
That's the method that the BSAC taught me in the 70's, do they still teach it?
Why is it dangerous to both parties?
1 - Risk of water inhalation by the casualty on the downward "dunk"
2 - If pulled into the boat facing upwards, the spine's curvature is stressed in the wrong direction as the spine curves over the tube
3 - The casualty can't be recovered facing inward to the boat as the (hopefully) inflated lifejacket impedes recovery
4 - The obvious risk of muscle / tendon strain to the rescuer associated with lifting heavy leads
5 - The chance of the rescuer being pulled overboard by the casualty - especially if the casualty is wearing "normal" clothing which will have become weighed down with water.
OK, some of these risks are associated with all recovery methods, but like anything it's a balance of mitigating as many risks as possible before embarking on a course of action.
Regardless of casualty condition, best method is still cradle / rope log roll.