Harry's rescue of Natsumi from the pelt of Tamamo-no-Mae in the Orochibunker. Harry refuses to die no matter what the Pelt throws at him, and breaks through to Natsumi's Battle in the Center of the Mind against the maddened essence of her past darkness trying to consume her.
Harry and Sirius, with some help from Kagotsuruhe, Juuchi, Tsukiakari, and Reivina, taking on 100 Dementors, in a battle that culminated with Harry casting a successful Patronus, followed by a Nukefuda that got boosted by Amaterasu herself, resulting in quite a few Dementors dying, and the rest being forced to run away.
While it ultimately might have contributed to her death Myrtle realized exactly what Tom was when she was alive, while he was fooling all her female classmates.
The battle against Kuroshi is one, especially after she summons a Gashadokuro to fight for her. Even though it takes the combined efforts of Nagato, Haru, Ai, and Jin to take it down, traditionally this is impossible.
Learning about the Kamo government's "Screw the World" plan caused Emperor Akihito to bid Kotegiri to don the Oda kimono, giving her license to hunt down and execute all of their remnants who had dodged judgement for their crimes during World War 2.
Emperor Akihito:"Is there none among the Oda who will answer the call of the Chrysanthemum Throne?"
During an emergency assembly of the Tokyo Magical Diet concerning the numbers of prefectures that have or are threatening to secede and join the Kyoto Diet, one Councilor Ito, a Jim Hacker politician and one of the last members of the Tokyo Diet that actually gave a damn about doing good for the people, gives a damning "The Reason You Suck" Speech to the Diet, and when word comes in of developments that mean a civil war could be imminent, mid-speech he calls for a vote of no confidence and singlehandedly kills the Diet in favor of Kyoto, preventing a potential civil war in the process.
One could say Operation Butterknife as a whole, but there are some specific moments:
Colombe uses her knowledge of Arabic culture to figure out a ghoul's trap and calls out said ghoul for how transparent it was.
Delilah dismantling the ghoul's pet serpent with precise shooting.
Zamarad using some excellent Loophole Abuse to warn Delilah of an incoming ambush. That the ifreet was ordered to facilitate.
The Battle of Saint Kitts between a multinational shipgirl force led by HMS Duke of York, USS Pennsylvania, U-96, and USS Enterprise and an alliance of Abyssals led by City Consuming Princess, Guinea Gulf Princess, and Middle Passage Princess. Notably it covers all aspects of WWII naval warfare in submarine and antisubmarine warfare, carrier duels, and battleship slugging matches. note The actual capital ship lineup was 24 carrier shipgirls, 22 battleship shipgirls, and 6 battlecruiser shipgirls referenced or shown on-screen. The Abyssal carrier force was 57 fleet and light carriers under command of Middle Passage Princess.
As per Word Of Godzilla (The OP of the story uses an avatar of Godzilla in a Top Hat and Monocle as his avatar on SB and SV) on the SV Thread, Magic Carpet Ride was played when the first Spacefaring Enterprise as one perfect Star Trek: First Contact reference
Neville's Trial by Combat against the Huntsman sent by Lily Moon's elf grandfather on her mother's side. He first fought off two draugr with one of them physically thrown out of the circle by Neville with his bare hands. Then he fought the Huntsman one on one and won by the skin of his teeth.
Masamune-no-Shimazu's actions during Blood Week. First, she saved the young girl Sugihara Kaya whom she is tutoring in magic from a bombing run with a barrier spell, then when she realizes that the Abyssals are attacking worldwide and that her family will be doing what they can do to help, she resolves to do the right thing despite being under a suspended sentence of death for the war crimes that she facilitated during World War Two. She goes to where her true body is locked away to retrieve it without authorization so that she can use her full power and skills to cast a self-renewing and self-sustaining magical barrier spell over most of Kyoto using a synthesis of all the magic that she has studied and mastered. When called to account for her breaking the terms of her parole afterward along with violating the Statute of Secrecy, she merely wishes to gift Kaya her empty scabbard to remember her by after her execution. Fortunately for her and Kaya, Emperor Akihito views that her disobedience of her terms of imprisonment was justified by the situation and merely commands her to get authorization first if she has to do that again to save innocent lives.
Shinano's Let's Get Dangerous! moment during Operation UNDERTOW when she finally rises above her angst over being an inefficient carrier conversion of a battleship hull as she chooses to sail into a close-quarters battle no other carrier could survive.
Shinano looked over at Ayase and the Winds escorting her clear of the clash of fleets.
"Then you don't need my help to perform your duties... but my sisters do. My friends and loved ones do. Regina does. Harry does." Shinano spoke to herself. "And I will stand by them. Forever."
With that Shinano suddenly turned hard starboard rudder to double back her course as her telegraphs rang for flank speed.
As Shinano moved onto her new course straight into the pitch black of the ash cloud ahead, the Winds and Ayase joined up with her.
Akagi screamed at the other carrier. "Shinano! What are you doing?! That battle is no place for a carrier!"
Shinano steadied on her new course of two seven zero. "But I am a Yamato-class carrier. I have the belt armor to take the punishment of the battle ahead. My loved ones need me. Japan needs me. And every ship must do her duty today."
With that uncompromising statement of resolve, Shinano slung her kyudou bow.
Trieste discovering the magical Sea Serpent 'Bloop' in the Nankai Trough at the bottom of the Pacific then in response Challenger Deep Princess demonstrates her Siren Song's full power as the Abyssal Elder Princess realizes that her first friend has been searching to make contact with her.
Kingsport for the Winters Network as a whole. First Delilah's covert team executes a picture-perfect black operation to break up an extremely immoral ritual by TOTEM's Maine branch. Then, when the ritual's disruption triggers a major Abyssal attack aimed at the wizarding town of Kingsport, Delilah hastily figures out what's happening along with a way to divert the Abyssals to buy time with a Heroic Sacrifice while calling in Zamarad and her contacts in the US Navy. The result is a fairly epic battle to protect the town by some third-line shipgirls seconded to the FBI, along with Zamarad revealing her true potential power level in a desperate attempt to come to Delilah's aid no matter what! Not to mention, the cover-up by the Winters Network and the US Government successfully prevents a major Statute break along with reassuring TOTEM that the Muggles are still clueless about their existence.
