Once a royal has struck and started the rest is instinct you can move them around and they are absolutely oblivious. (why they will not feed unless they are in 'safe surroundings' the snake is taking no harm and it is not really much to do once it starts you could try hot water or cold water or mouthwash or any number of other folk things but the best thing for the snake is to just wait it out so it and let it let go. When you think on some of the ways people try to get them to let go waiting for instinct to click off seems quite responsible.