: Earlier in the episode, Moira Queen holds a televised press conference where she confesses her involvement in the Undertaking and exposes Malcolm Merlyn's plan to the city. Key Highlights

: Detective Lance, with help from Felicity, manages to disarm the first device located under the Merlyn Global building. However, the second device, hidden elsewhere in the Glades, successfully triggers.

" Sacrifice " is the high-stakes Season 1 finale of Arrow , delivering a tragic and game-changing conclusion to the show's debut year. The episode focuses on Oliver Queen’s desperate attempt to stop Malcolm Merlyn’s "Undertaking," a plan to level the Glades using a man-made earthquake.

: In the ensuing chaos, Laurel becomes trapped in her legal aid office. Tommy Merlyn rushes in to save her. He manages to get her to safety but is pinned by falling debris. Oliver arrives to find Tommy dying; the two reconcile their friendship before Tommy passes away, a death that deeply traumatizes Oliver.

: The episode's destruction of the Glades and Tommy’s death set the darker tone for Season 2 and fundamentally shifted Oliver’s mission from "vengeance" to "heroism".