Grease shrugged. "I honestly don't know for sure. It seems like every pony I've talked to has a different story about what happened. Some say that there was a changeling disguised as the bride, others say it was the groom, or maybe one of the guests. I've heard stories of the changelings ponies hostage to force the shield down, or mind controlling the guard. There's even some who say that a changeling beat Princess Celestia in a magic duel." She shook her head. "Really, how about that for exaggeration? Just about the only thing everypony agrees on is that a changeling got into the wedding. They are shapeshifters, so it makes sense that they pulled some kind of underhoofed trick."