Well it may be like that with those that attacked the priestess since the master orders them, so they had to obey the will who controls them, as with Ryoko is different case as above said, the person did nothing like that that may initiate her obey the will of the person who wears it for her, and yes i not mention what the necklace do too that is revealed ofc later by Natsuki (about her body being more mature shhh.).