[s4e5] I Hear You Knocking -

: The two are drawn to an abandoned house where they are intended to kill each other, providing a massive sacrifice of power for the Hollow. Ultimately, Klaus spares Marcel, knocking him unconscious instead—a major moment signaling his ongoing redemption arc. Ancestral Secrets & The Werewolf Link

: Marcel is haunted by visions of Elijah and Klaus, who goad him to finally seize his revenge against the Mikaelson family for their centuries of betrayal. [S4E5] I Hear You Knocking

: Hayley discovers that her parents were murdered by Mary’s husband while he was under the influence of the Hollow. : The two are drawn to an abandoned

The Hollow anchors itself to the living world by exploiting the darkest fears and past traumas of powerful supernatural beings. Klaus spares Marcel