I only just saw the play on video. Phillips biggest mistake in the play was probably that he had slowed going around second and then sped up again. If he wanted to go, he had to maintain full speed. Otherwise great throw by Posey who was clutch this series.
Edit: Rewatching it I can't tell if he had to slow due to the angle of turning the bag but I don't think so. I think he surprised Posey wasn't to the ball yet.