Deck Motion at RFK Stadium on 10/22/17:

 

The initial loop shows the deck bouncing as the NY fans are all in sync and participating. The second closer view shows what happens as participation dropped and/or synchronization was off. There were a couple of times earlier in the game with even more motion of the deck but couldn't get it on video in time. Tried to get some slo-mo but it isn't easy to track the motion.