The Magician King is still a really good book for a narrative.  From the last post, they said that they would have to talk to the dragon, and that Quentin would do the talking.  Needless to say, Quentin wasn't excited about this.  But he knew he would have to if he wanted to get back to Fillory, which he did.  So, they have to stand on a bridge with a steak and jump in at midnight if they want to talk to the dragon.  Then at midnight, Quentin jumps into the canal, and Poppy also follows in the hopes that she will also talk to the dragon.  At first, nothing happens when they get into the water.  But after about a minute, the dragon drags Quentin under water.

At first, Quentin can't breathe.  But then the dragon casts a spell that lets him breathe under water.  Naturally, the canal bottom is filthy and littered with trash.  But the dragon that lives there also collects new, old, important, and famous artifacts, magic or not.  As they talk however, Quentin learns from the dragon that they can't use the button to get back to Fillory, as each entrance can only be used once.  But as they finish, the dragon tells Quentin that the first doorway is still open.  But before Quentin can ask what this means, the spell ends and Quentin must swim to the surface of the canal.