There is actually no stay command.
I, personally, do not train 'stay'. I train the command (sit, drop, whatever) and train a release. This is the equivalent of stay- it means 'you do not move until I give another command, or release you to your own time'. But my dogs have no 'stay' command. The word means nothing to them.
TOT is similar- no stay, just a release on focus.
Does that help?