Standoff - Season 1 Episode 13 Backfire
Overview: Matt and Emily negotiate with two armed bank robbers who take a subway full of hostages. During the negotiation Matt is pulled away to deal with an hostage taker who Matt has met and successfully negotiated with, who has taken a therapist and the therapist's husband hostage. Matt talks the man who believes that an Evil Psychic Agent has taken the form of the therapist husband.