Thanks UKCE1861, just sent you a PM.
So in summary for LL:
If pitcher is on rubber and catcher is squatting ready to receive and if the base runner is on the base, then the runner can not lead or steal, so the ball is technically dead.
If however, the runner was off the bag prior to the pitcher and catcher being ready to go, then the runner is free to make a decision to either return to the bag, or steal at his his own risk.