The degree of intensity of the kick-back of the spell depended upon the force of the one intending to cause the harm. When Henry tried to smack her arm he was pushed backward with the same amount of force. She smiled at him. "I think that it is working." There had not really been doubt that it would not but there was always the chance with magic.
Picking up the rosewood disk off of the ground she handed it to him. "You can do with that what you wish. If you would like to keep them at the office so I can watch them that would be fine. Or if you want to keep them in each of the safe houses that would be fine to." She realized that she might not have explained the disk properly she continued. "If someone or something tries to tamper with the barrier spell, or if the spell is completely broken? The disk will turn red."