We were camping and I watched a 3 year old pulled from the water, cold, blue and not breathing. I did CPR on him on the boat ramp. kid came around after a couple of minutes. Before time of cell phones and no phone access.
Kid was still pale, weak, etc. but alert, breathing, etc. but I advised parents to take him to the closest ER as he needed overnight admission to be observed, chest x-ray, etc. They left and were gone a couple of hours. Showed back up and said they went to ER and it was busy so they got tired of waiting and left before seeing a doctor. They thought he was just fine.
Kid ended up having subsequent seizures as a result of lack of oxygen to brain due to near drowning.
So, yep, could very well have happened. Some folks do not think like most responsible adult parents.