I dont know why everyone is saying "dont take you kids in the park" etc. if that kid is learning at that age, who knows what he'll e able to do when he gets older.
impressive that the parent was especially aware of the nature of this feature and trying to bring his kid out of the danger area so following riders wouldnt hit it but still lacked the general awareness regarding the overall danger of letting its kid hit that feature nor respecting the potential neck/head injury in ANY way.