Janssen explains how in the locker room before the opening faceoff, Pete DeBoer, the Devils bench boss at the time let the 4th line know they were going to be starting. During warmup, the two 4th lines got together and decided that's how they'd kick off the game.
I have to say, it's a little surprising there was no real bad blood that sparred the brawl on March 19th 2012, given the fact that both coaches were rather heated, but it just proves that the game has changed dramatically in the past 11 years.