1. It is never permissible for one child in a school to be asked to supervise another child with no teacher present. A child is not someone to whom a teacher can delegate supervision as a child is a minor, not qualified and needs care themselves. So this form of supervision is unlawful and will lead to a cause of action against the school should students or their teacher sue. This is particularly so if one child doing the supervising bullied or intimidated a younger child under their control. This will give rise to strict liability on the part of the school. It makes no different what the weather is. The law is the same here regardless of the weather. One child should not be asked to supervise a younger child without control in the form of a teacher being present.