Teana follows her StrikerS Sound Stage X moment up in ViVid when she and Nanoha BOTH use Starlight Breaker on the field. The resultant 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 Einhart. 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 delivenring a sound beating to a shocked Einhart.
Miura defeating Micaiah Star Saber; a kick that apparently utilizes "breaker magic". Which basically makes it the kicking equivalent of Starlight Breaker.
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 dissapoint, showing high proficency 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.