The Fastnet raised an important issue when recovering casualties from the water - as they chill due to water temps, the hydrostatic squeeze of the water around their lower body keeps warm blood near the core.
If you lift them vertically (single strop) they lose the squeeze, more blood drains to the cold extremities and the body reacts as if it has lost blood (hypovolaemia) and goes into clinical shock - this can precipitate cardiac arrest.
The best way is to double strop lift them (one under the arms and one under the back of the legs) so they come out horizontal and avoid those complications.