It's hard for her to accept that. Joan has carried the grief and the guilt for a number of things over the course of her life, from the patient who died on her table to Liam being lost to drugs to Andrew's death. She's dedicated her life to saving people, and when she fails it sticks with her.

She's quiet for the rest of the ride, just resting against him. She can't even plan out what she's going to say. She's too tired and in pain.