To engage a child you do not need to forbid something but to engage in something or intrest or worth. When rolling note how the head and eyes are free to move and removed from harm when you point one finger upwards and look at the finger throughout the roll. This way you learn to remove what is blocking your way even if it is a part of you without having to consider it as danger or harm. How you define what you are doing limits and guides you. The more your movement is without names and tags the less you need to carry and overcome.