Also worth mentioning is Rider's reaction to this moment: her loyalty to him changes from something more akin to an obligation to duty and friendship to true Undying Loyalty.
Bazett's reunion with Lancer, especially once they figure out how to communicate without Kirei cottoning on (by using Gaelic, a language he doesn't know).
Justified Title: "Witch Hunt: Dawn" shows how eerily similar Rider's past life as Medusa is with Ichigo's current lifestyle as Substitute Soul Reaper. Ichigo, himself, thinks of it as an allegory of what would happen if his Inner Hollow took over like Rider's Gorgon Form because of his constant insistence on handling everything alone. He even compares it to a twisted 'black reflection'.
Moral Event Horizon: Caster almost certainly crosses it with her experimentation on Hollows.Assasin is notably unnerved by her and her actions, even moreso than in canon.