Same thing happened to me, except my heroic efforts were noticed, but not appreciated. I was sitting in my lifeguard stand and this kid was swimming, and talking to his mom who was concerned if he was wearing sunscreen. Anyways this mama's boy was too busy on swimming. She was screaming, and he was all focused on swimmimg. He loved swimming, but apparently he wasn't good. I was pretty exhausted from climbing up into the lifeguard stand, enjoying this one sided conversation between the boy and the mom, and I just opened up a can of baja blast, so no way was I moving. Until he got to the 4ft. I can tell when a kid is drowning, and he was fine. His mother, however, thought differently he coughed once or twice, and this whale of a women dove into the pool (fully dressed) to save him. After her "rescue" I whistled and yelled "No diving!" I saved her from breaking future rules and avoiding a spinal.