If he wanted to outlaw gamesmanship, I could see the logic. But he seems to be mad the Packers are good at it.

I actually think getting five yards for the 12th defenseman is kinda dumb when the guy is at full sprint at the sideline. However, the alternatives would be nearly impossible to officiate. "He clearly had intent to exit the field in a timely manner". So both feet OOB it is.