I've witnessed a quite opposite situation once (the later recollection of things happened). A small group of teenage and smaller kids from one family were playing in the lake and were behaving extremely laud. Fooling around like jumping up and down in the shallow water with their hands up and screaming like crazy, including a drowning imitation play. People on the beach were kind of trying to adapt to this noise for an hour or so (we've moved farther from the water with our little baby trying to get a nap). There were no LGs on duty at that evening time. Nobody, even children in the water in close proximity of the drowning boy were understanding that something wrong is going on with one of the older kids, perhaps because his behavior has changed very little when he has started to drown for real, until one of the younger kids came out of the water and told his parents that his cousin has disappeared. When parents started to search for him asking other children and calling his name it was a quiet moment when the boy has managed to jump to the surface for the last time and scream indistinguishably. Then his head disappeared forever. Several men jumped in the water immediately. The boy was only around 50-70 feet from the beach. However, only after about 5 minutes of searching the water one of the men has finally managed to locate the boy and take him to the shore. Someone has called the ambulance. One of the men has immediately started the CPR, but of course it was too late already.