If the user chooses in the UI to slide a stone, there's no way to un-choose a particular stone once chosen (other to pass entirely). The user ought to be able to click the selected stone itself to "turn it off" and choose a different one.
(low priority)
If the user chooses in the UI to slide a stone, there's no way to un-choose a particular stone once chosen (other to pass entirely). The user ought to be able to click the selected stone itself to "turn it off" and choose a different one.
(low priority)