On a crowded subway, a child clings to a small box while bystanders plead, threaten to smash it and demand it back; Ms. Langley is called to intervene. Cut to Dr. Jones discharging Ms. Langley: she is diagnosed with PTSD from years dismantling bombs and warned to keep the disarm module safe—the module unexpectedly became the key in her treatment. Back on the train, the arguing child suddenly apologizes and begs to have the box returned. The episode closes unresolved as a sudden shout rings out: "What are you doing?"