The Yemen sequences and the Sully leverage — the game using the mentor-protégé relationship as its emotional engine the way Among Thieves used Elena. When Talbot learns of Sully's location, the game shifts from puzzle and exploration into the desperate register that Uncharted uses most effectively: the situation where the adventure becomes personal, where the treasure is no longer the point and the person is. Nate escapes because he has to. Sully's location is the information that makes escape necessary.