Bad Blood

Bad Blood is the thirtieth episode, and the season finale of Season 6 in Criminal Minds: Cases of the Wizarding World.

Summary
When the British Ministry of Magic received tip of a deadly plot started by the Death Eaters, the Federal Bureau of Investigation joins forces with the Department of Magical Law Enforcement to uncover what really is happening.

Recap
A man was found dead in his home with bullet holes and a dark mark burned directly through his chest. The victim, Tobias Snape, is a muggle father to Severus Snape. The body is identified by Severus Snape himself.

Meanwhile, Christopher is still investigating on who shot down the rope during his suicide attempt when Garcia reviewed the footage. After realizing that it was Chloe White who was on Dumbledore's orders, Garcia contacted him directly explaining her observation, but not before pulling up her medical profile, where she realizes that she is actually half-blood.

Confused, Christopher ordered Garcia to pull up medical profiles of her immediate family, but not before coming across an extended family photo from Thanksgiving dinner; whose father is not in the picture, but a youth pastor. Garcia then alerted Prentiss on what she just found out, and she responded saying that the father wasn't in the photo because he was a Death Eater at another location. Garcia then checked the father's medical record, only to find that he is pureblood. Checking is personal record as well, it is revealed that he is the living heir and direct descendant of Salazar Slytherin, save for Delphini Riddle.

The family in question has been warned of the blood status changes, and is asked if there was anything suspicious with the father. [The mother] said that he has been gone from the house a lot, barely returned home since the Dark Lord returned back in 2015. He did claim that he was on a cruise, but turned out to be a lie.

After returning to business at the Ministry of Magic, he has been called by the New York Police Department regarding more information of the Tragedy Strike that happened in early November, as well as to what actually started the D-19 virus pandemic; which turned out to be caused by the father, the same one who was not in that Thanksgiving photo. Horrified, Christopher took off for a few minutes to breathe, but not before Dumbledore calls him over to the family home for urgent matters.

Dumbledore spoke to Christopher after being called in to warn him that the family is in more danger than the FBI thinks they are. The unsub is inside the home ready to pounce on the family. After a few minutes, Christopher calls in Detectives Ryan and Esposito of the NYPD to assist him in evacuating the remaining four non-death eater family members. Unlike other rescue missions in the past, Christopher knocks down the door to the home, meaning that he is much more worried about the daughters, given the fact that he is not taking any chances.

The mother then tells him at a distance that the unsub is in the basement, so they entered the basement, only to find a giant chamber that resembles the Cathedrals run by the Roman Catholic Church. There, an empty chamber is filled with bodies of the victims of Death Eater attacks.

Then the trio entered a chamber that looks identical to the Death Chamber in the Department of Mysteries, where he is confronted by Death Eaters. Later, aurors were dispatched to the basement where they defended the area, but Sirius Black was killed by Bellatrix Lestrange. He chased her, tortured her and pointed his wand at her. Meanwhile, the unsub is pressuring that he'd kill Bellatrix, but later spots the unsub.

Dumbledore then walks into the chamber via Floo Powder, along with Chloe White. Dumbledore and Vincent-Crabbe White got hooked into the duel while ordering Christopher and Chloe to stay back. Christopher, spotting Prentiss, sends Chloe over to her, saying that he will handle things from here.

Dumbledore then calls him to get the sword, as he knows things will get more dangerous from just a duel and he went in and hunted for the Sword of Gryffindor, only to find a giant statue of Godric Gryffindor, pulls the sword out and holds it.

It wasn't long until Vincent spotted him with the sword and conjured a basilisk. However, after a heavy duel, it was killed by two lethal stabs while blind. After its death, Vincient stares at the lifeless beast while Christopher grabs a copy of Mein Kampf written by Adolf Hitler. After confronting him on his Nazi beliefs, he took the sword, and sliced the book in half, taking the power away from him. He was later arrested by the National Security Administration and was turned into the FBI.

Christopher, awarded from the Catholic Church of Magical Affairs, the Magical Congress of the United States and the British Ministry of Magic, ended up retiring from the Behavioral Analysis Unit because he needed to rest because of his condition. He is awarded Order of Merlin First Class and has been given two varsity letters to the sport of his choosing. One from Harry Potter and one from Hermione Granger.

Music

 * Know You More (Live) by Hillsong Live, lead by Darlene Zschech.

Bookend Quotes

 * Emily Prentiss: Curiosity is not a sin.... But we should exercise caution with our curiosity. - Albus Wulfric Brian Percival Dumbledore
 * Spencer Reid: So do not fear, for I am with you; do not be dismayed, for I am your God. I will strengthen you and help you; I will uphold you with my righteous right hand. - Isaiah 41:10

Trivia

 * The soundtrack used in the episode is scored by John Williams, Nicholas Hooper and Alexandre Desplat.
 * This is the first episode that all works in the soundtrack that is scored by all composers of the Harry Potter films, with the exception of Patrick Doyle and James Newton Howard.
 * The exception is at the end of the episode (before the credits) where the song, Know You More by Hillsong is played.
 * Sirius Black's death scene and the scene following that is very similar to as depicted in the film adaption of Harry Potter and the Order of the Phoenix
 * This episode is the first to be double length.