I believe you are thinking of:
10.2.1
"A competitor who fires shots while any part of their body is touching the ground or while stepping on an object beyond a Shooting Box or a Fault Line, or who gains support or stability through contact with an object which is wholly beyond and not attached to a Shooting Box or Fault Line, will receive one procedural penalty for each occurrence. However, if the competitor has gained a significant advantage on any target(s) while faulting, the competitor may instead be assessed one procedural penalty for each shot fired at the subject target(s) while faulting. No penalty is assessed if a competitor does not fire any shots while faulting."