If your the one being rescued, you wouldn't feel the zap unless the hook / basket hit you first. The zap is not that strong as to travel to body in the water.
If you are the rescuer on the hook going into the water and the conditions are right for increased static electricity, you will feel it. Some times you might even bite through your tongue as a result of the zap.
Beware!
A zapper snapper is a good idea when the conditions warrant it. (Have been using our three metre length of old hoist cable for years but never had a name for it until now - Thanks
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Regards
Breeze