But the rule is specifically stated for when the clock is stopped and it says there should be a 10 second run off. It says that right in the rule....
INTENTIONAL GROUNDING—SPIKE TO CONSUME TIME First-and-10 on B30. The game clock is stopped with six seconds left in the first half. QBA1 takes the snap and immediately spikes the ball into the ground to take one second off the clock so that a field-goal attempt will run out the clock. Ruling: Half over. Intentional grounding and a 10-second runoff. A QB can only spike the ball to stop a running game clock. An attempt to take time off the clock is intentional grounding.