Mace’s arrival on the Zephyr to arrest Robbie and Daisy forces the team to confront their loyalties.
For years, Robbie allowed Gabe to believe a "Good Samaritan" simply pulled them from the wreckage. The revelation that Robbie's survival was tied to a murderous spirit creates a significant rift between the brothers, as Gabe struggles to reconcile his heroic image of Robbie with the violent reality of the Ghost Rider. Scientific Ambition vs. Dark Consequences [S4E6] The Good Samaritan
Robbie’s transformation is revealed to be a desperate plea for his brother's life. As he was dying, he prayed for a second chance to save Gabe, which was answered by a "Good Samaritan"—revealed to be another Ghost Rider (implicitly Johnny Blaze) who passed the Spirit of Vengeance to him. Mace’s arrival on the Zephyr to arrest Robbie