Actually, despite what the idiot rules expert on TV said, that was not intentional grounding.
Here is the rule.
RULE SUMMARY VIEW OFFICIAL RULE
INTENTIONAL GROUNDING
It is a foul for intentional grounding if a passer, facing an imminent loss of yardage because of pressure from the defense, throws a forward pass without a realistic chance of completion. A realistic chance of completion is defined as a pass that is thrown in the direction of and lands in the vicinity of an originally eligible receiver.
I highlighted the important part.
Allen was not about to be sacked. It was a clear miscommunication.
NFL officials are bad and getting worse.
Why the NFL, a $10 billion/year industry depends on part time, old, bad officials accountable to no one is beyond me.