Just as he finds his voice and chooses to do the "right thing," he is unceremoniously executed by Arthur Ketch . Fans have widely noted this as a "gut punch" that cut short a promising redemption arc. The Hunt for Kelly Kline

Lucifer puts on a show of submission, even licking the floor to please Crowley, but it’s all a ruse.

The heart of this episode is undoubtedly . Through chilling flashbacks to 1987, we learn he was forced to kill his best friend as a child at Kendrick’s Academy to prove his obedience to the BMoL Code.

The British Are Coming: A Breakdown of Supernatural 12.17 Buckle up, hunters! Season 12, Episode 17, titled finally peels back the curtain on the ruthless inner workings of the British Men of Letters (BMoL) while escalating the stakes for Lucifer’s unborn child. This episode isn't just about the hunt; it’s a tragic deep dive into loyalty, indoctrination, and the brutal "Code" that governs the BMoL. The Tragedy of Mick Davies

"Supernatural" The British Invasion (TV Episode 2017) - IMDb