@calfoxwc said:

I think it's because the immediateness of it negates the claim that the qb is doing it to avoid a sack.

So, it is allowed because the intent is to simply and immediately stop the clock.

Exactly!

The official rule is:

"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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@calfoxwc said:

I think it's because the immediateness of it negates the claim that the qb is doing it to avoid a sack.

So, it is allowed because the intent is to simply and immediately stop the clock.

That makes sense, thanks. I always thought it was a loop-hole in the NFL rule book.

So, it is allowed because the intent is to simply and immediately stop the clock.