Once they meet in the forest, they had a short conversation about how Tristen could move back into the castle. The queen becomes very excited and then after a couple says Tristen moved back in.
The queen goes outside to meet Tristan outside the castle. She is so excited that she can finally see him every day and talk to him. She then thinks about how her husband could notice how much they talk and she then becomes worried...
After a couple minutes, they decide to go into the castle and get Tristan set up in his room.
The queen then shows Tristan where he will be staying. She helps him set up a couple of his belongings and then she asked, "Would you like to go to my room?" Tristan accepts the offer.
They walk down a long and narrow hallway to get to her bedroom. The queen warns Tristan about how the steps are broke at the bottom and you have to be careful stepping down..
Tristan, of course, didn't listen well and forgets about the stairs. Well, when going down them he falls and that made the queen fall also. They both lay in pain and eventually freeze to death.