I've heard the mom was on her phone, and also that kid told her he was going to do it beforehand, which should certainly raise a red flag. Can't remember what else.
May or may not be true, but it does call the parenting into question.
Kimberly Ann Perkins O'Connor, who saw the incident, said the boy told his mother he was going to get into the moat. The mother told her son to behave before she became distracted by other children with her, O'Connor said.
"The little boy himself had already been talking about wanting to go in, go in, get in the water and his mother is like, 'No you're not, no you're not,' " O'Connor said. "Her attention was drawn away for seconds, maybe a minute, and then he was up and in before you knew it."