Though, it's good to note that Lizzie is a member of the Middleford family, known for their exceptional swordsmanship.
What really seals the deal is how she addresses the zombies. She states proudly that she's not only gonna be Ciel's wife, but she also states how she will be the wife of the Queen's Watchdog. THAT'S amazing.
The entire MIDDLEFORD FAMILY kicking zombie butt while protecting the innocent civilians on board.
I also recommend the servants when the Circus tried to invade the mansion. Ciel didn't necessarily hire them for cleaning the house; he hired them to take care of intruders while he's away. Mey-rin is a sniper with great accuracy, Finn is a superhuman person who can throw heavy objects (E.g: marble statues) at his opponents, and Bard is a war veteran whose very dangerous with firearms like a gatling gun and a flamethrower. Add them together and you get some WAY badass fighting scenes with these three.
The start of that sequence really sells it. Jumbo has apparently bashed Finn's head in, and apologizes to him as he walks off. Then Finn grabs his leg. Meanwhile, Ciel is mocking Joker's proclamation that the Circus never leaves survivors: "What do you take them for? They are servants of the Phantomhive Family." Finn tells him that Ciel told him not to let anyone onto the grounds and punches his head in..
Just then Peter and Wendy sees Finn kills Jumbo when he ask him to not wake the mistress up. They both tries to kill him until Wendy was instantly killed by a headshot. Intend to take out the sniper, he was shocked to find out that Mey-rin's the sniper and uses a crazy amount of rifles just to save time from ammunition. This also gets him killed when realizing that she even could shoot Wendy from a very far distances.
Beast and Dagger, unaware that their allies are dead, sneak inside the house only to find Bard in his badass moment while ordering both Finn and Mey-Rin to deal with them. Once they enter the kitchen, Bard greets them only to reveal his weapon and shoots them. Out of self-defence, Dagger was killed; protecting Beast. But she meets her fate as she was killed by a powerful flour explosion.
So to speak considering this is the only time all three reveal their badass moment, this is why Ciel consider them as "Servants of the Phantomhive"
chapter 61 Undertaker vs Ronald, Grell and Sebastian at the same time. Undertaker is winning as of the end of the chapter, with very little apparent effort..
Chapter 63, after the prolonged flashback of Sebastian and Ciel's meeting and training of playing the parts of Butler and Earl, it cuts back to Sebastian still bleeding profusely from being hit by the Deathscythe. With a huge scream, he manages to propell himself forwards mid-air to grab Ciel's hand and lands safely with him in the next chapter.
In chapter 64, Undertaker cuts the Campania in two.
Also in chapter 64: Sebastian taking down Ronald despite the fact he can "barely stand up".
Sebastian taking on an entire horde of zombies in a lifeboat while floating in the middle of the frozen Atlantic all while bleeding heavily in chapter 65. He wins, of course but that does not make it any less thrilling or badass.
Chapter 71 for Ciel. To retaliate against Maurice Cole, he confronts him about his lying (from the time to meet at the Swam Gazebo to making others do his chores). Once cornered, Maurice attempts to have his friends rape Ciel, but the heads of the dorm charge in, having overheard everything because Ciel had tapped the room. Maurice is then denounced by Redmond and breaks down. Ciel then offers a tissue to him and says that they can start anew, right before revealing that he spread around pictures of Cole without makeup on because 'to start, everyone should see your true face.' Revenge is a dish best served cold indeed.
After reading the above spoiler, you might be wondering "How did Ciel tap the room? Isn't this series supposed to be set in the mid-19th century? Surveillance technology hasn't even been invented yet!" And you would be right. How Ciel did it is attach strings to every painting in the room and connect them to the ones in the Swan Gazebo. He even explains how it can transmit sound almost exactly like the old "two-cans-and-some-string" telephone trick some people made as kids.
Chapter 77 for Edward. To win the cricket tournament's deciding match, Ciel and Sebastian decided to use an orchestra to disguise the use of a particular sound to signal when a pitch hits the ground so the Blue House players can strike it at that exact moment, resulting in them earning 40 points in a row...then Edward steps in. Not only does Edward see through this, but he beats it! Having learned to use the Purple Burnout used by Cheslock through observation alone, he proceeds to consistently bowl out Green House, beating Sebastian's orchestra's swing. Sebastian was shocked that this happened.
Chapter 79 for Lawrence Once it's his turn to fight Edward, he somehow tosses a ball up in the air, turns around and walk away. What the audience sees it as a wild ball until THE BALL HITS THE TARGET LIKE A METEORITE IMPACT, surprising everyone even Edward.
It's a small one, but, in his introductory episode, Agni the Funny ForeignerBattle Butler actually manages to get a draw in fencing against Sebastian. What is confirmed by Sebastian himself to be nothing more than an ordinary human — not an asura, demon, angel, shinigami or any sort of supernatural being, just a plain vanilla Badass Normal — managed to get a fencing draw against the most powerful demon in the series. And he did this against a Sebastian who was going all out — Ciel directly ordered Sebastian to win, so that means he was fighting with no Power Limiter.
The werewolf arc in general.
A werewolf busts through the window. What does Finny do? He jumps to protect Ciel. Said werewolf claws up Finny's back while he's protecting Ciel. Finny's response?
And cue side-kicking a werewolf (while still shielding Ciel with his own body) through the door immediately after the above line.
The fact that Sieglinde was able to create the what is possibly the most lethal gas ever created at the age of eleven is really quite the feat, even though she was being tricked into thinking a completely different story/had her entire life controlled/had her legs parentally broken by the orders of her own mother in order to make it happen .
Zombies on the Titanic. That is all.
Killing zombies with a lawnmower on the Titanic.
Horse-drawn zombie carriage on the Titanic.
Cute, adorable Lizzy kicking zombie ass on the Titanic. With TWO swords.
1 episode of Book of Circus is simply filled with CMOA : Lord Brandel, a tea manufacturer ( and also a gun trafficker visits the Phantomhive estate to ask Ciel for his help in promoting Brandel's new tea range specially for children. It's just an excuse: Lord Brandel has hired fifty (!) hitmen to kill Ciel, Sebastian and all the servants, because "The Queen's Watchdog" is standing in the way of expanding the gun trafficking business.
One: Sebastian beat down all of the hitmen using cutlery and a flame-thrower.
Two: Ciel and Sebastian offer Brandel a cake "with a surprise inside" to match his "new tea range". Surprise meaning a bullet from one of the hitmen Sebastian defeated.
Three: Cedric, visibly shaken, calls Sebastian a monster. Sebastian happily agrees with him and changes into his demon form.
Four: This brilliant line from Ciel: "You know why nobody knows what happened to the people who were in conflict with the Queen's Watchdog? Because dead people can't talk."
Mey Rin, Finny and Baldroy were already awesome in the manga. In the Book of Circus, their badassery is taken Up to Eleven - Finny throws around giant, marble columns like a rag doll, Baldroy can ignite matches using the soles of his shoes, and Mey Rin...is too awesome for words. No wonder that Sebastian was quite amused when Joker mentioned their plan to "kill all the servants".
Chapter 99 has Sebastian go on a killing spree. First he annihilates all of the German soldiers that try to kill him with mustard gas, by surviving direct exposure to it and then using it against them. Then he inhales the gas and tracks down Sullivan's mother, reminding her that she loved her precious gas so much that she was willing to ruin her own daughter's life for it, and then rewards her by grabbing her and breathing the gas down her throat. Then finally he destroys all of the formula and notes on the gas, so that no matter what happens, the Germans won't be able to recreate what they tricked Sullivan into making.
Chapter 100: The servants of Phantomhive vs. Wolfram and his comrades. Points for Wolfram for actually being able to overwhelm Bard and Snake. Too bad for him that Ciel had disguised himself as Sieglinde and left her to Finnian.
Chapter 101: Wolfram manages to dodge Ciel's bullet, which was pretty much point blank/aimed right up against his face! However, when he's about to return Ciel the favor, an old friend of Ciel's father, Diederich, saves Ciel just as Wolfram fired.
Chapter 102: Sebastian vs. giant, armored German panzer. Guess who won.