I found one from 2017.
https://nflcommunications.com/Docume...20Rulebook.pdf
Quote:
A.R. 8.87 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.
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I guess the numbers change every year.
But the thing is they have other places where the refs are supposed to make a judgement in call in the QBs intentions - specifically for intentional grounding. So here it's clear the QB is doing it to burn of more time so a FG attempt would run out the clock. Which clearly is not what the Chiefs were doing. I can easily see how the refs could interpret it a different way and not call a penalty on KC.
I see why they made the rule though. They don't want a team spiking it 3 times to burn 3 seconds off the clock before a game-ending FG attempt. That would be annoying and taking advantage of the spike rule. But again - clearly not what the Chiefs were doing.
The average fan has no idea how complicated the rules really are. I was discussing this play during the game and my casual fan cousin was looking at me like I was speaking Swahiii.