NFL Rules Digest: Intentional Grounding of Forward Pass
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Intentional grounding will be called when a passer, facing an imminent loss of yardage due to pressure from the defense, throws a forward pass without a realistic chance of completion.
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In the case of stopping the clock, I don't think that would qualify as "imminent loss of yardage due to pressure from the defense". Spiking the ball is proactive, whereas a pass that would qualify as intentional grounding is reactive.