Did the umbilical to the fairing detach properly? It looked like some of it was still hanging off the rocket as it cleared the tower.
Congratulations, you could work for S&MA. They thought the same thing on AV-10. It's the Centaur version of the GUCP. The simpler mechanism I talked about before. It's the GH2 vent fin. It continues to vent during ascent as well.