Chapter 15: Teana follows her Striker S Sound Stage X moment up in ViVid when she and Nanoha BOTH use Starlight Breaker on the field. The resulting conflict destroyed almost all parts of the battlefield. In the end, Nanoha is defeated and Teana's still standing! In Nanoha's defense, Teana was still at full health (2500 points) when the exchange occurred, and only barely survived it. Nanoha had less than half that much health. Still an epic moment all around though.
Sein: "...What's this? Ragnarok? Armageddon?"
Corona and her entirely new style of fighting by making golems and then using said golem to Rocket PunchOne-Hit KO against Rio AND Lutecia and all they can do is stare stupidly. Freaking awesome!
Taken to new levels of awesome during her tournament match with Einhard. Everyone was expecting one or two good moves from her before being beaten by Vivio's official rival but ended up being quite the contrary, Corona has the upper hand and is delivering a sound beating to a shocked Einhard.
Miura defeating Micaiah with Sword-drawing: Starbright Blade; a kick that apparently utilizes "breaker magic". Which basically makes it the kicking equivalent of Starlight Breaker.
Miura vs. Vivio's match was an example of epic for both competitors. The exchange of blows throughout displayed an example of essentially two Lightning Bruisers pummeling each other. And surprisingly, Miura wins despite suffering three concussions, each worse than the last. Miura defeated not only the main character, but a character who gave Einhard a challenge!
Victoria vs. Chantez, period! The little nun displayed an amazing variety of unique combat techniques that even include freakin shadow clones of herself! She even gains the upper hand for a moment. But the mighty Thunder Emperor didn't disappoint, showing high proficiency in blocking and responding to Chantez's attack finally culminating with a crushing victory over the little prankster. Such strength and fortitude may qualify her as the first consistent Mighty Glacier of the franchise.
Erio actually manages to get the drop on Fate just as she switches to Sonic Form, dealing a pretty critical blow... and ruining her outfit, for added points.
Sieglinde Jeremiah was, from her first appearance, touted as a ten-time winner of the DSAA and was supposed to be seen as unstoppable. Then we see her fight on-screen and she throws the Informed Ability trope right out of the window with a vengeance by subjecting Einhard to a Curb-Stomp Battle.
She follows this up in Chapter 48, displaying how strong she is by breaking out of Fabia's prison jar while naked, while other finalists such as Miura and Hallie were captured, then sweeping whatever the Witch girl throws at her with ease.