Steve puts himself in grave peril at the scene of a domestic siege when he ignores MRU protocol and enters the house where a young man has taken his parents hostage. Claire's past continues to menace her when Ian returns to confront Claire. The argument results in Ian collapsing and Claire is forced to get him the medical help he needs. The man she fears is, once again, a patient in her ED. While nursing Ian, Gabrielle comes to understand more about Claire's relationship with Ian, and the genuine grounds for her fear of him. Bart's sensitivity and wise counsel to a young woman who has suddenly found herself unable to have sex with her boyfriend causes Amy to see him in a different light.