re: One of the biggest chokes of all time

Don't want to hijack, but didn't want to start a new thread just for this. Why did Green Bay decline the personal foul on the Seattle OL during the first quarter? Green Bay had just sacked Russell Wilson and one of their OLs came in and speared the GB defender. Ref even said, "after the play..." so I don't get why the personal foul wouldn't have been tacked on to the sack. Any rules gurus know what was going on there?