Luna, despite suffering from the effects of both a sleep spell and Changeling anesthetic, wills herself to break out of the cocoon she's trapped in, One Hit Kills the two Changelings guarding her, and then drags herself to the Bifrost's controls to bring Rainbow Dash and the others home. And even then, she tries to keep going to help them, with Rainbow Dash having to order her to go see a doctor.
Rainbow Dash vs Trixie at the climax of Soar.
A villainous example from the same chapter: Chrysalis is Genre Savvy enough to realize Trixe will double cross her, and thus survives the story.
Fleur's Kick the Son of a Bitch moment, using her shapeshifting to scare off the bullies who have been bullying Cupcake.
Sweetie Belle calling out her mother for being a selfish Jerkass who has always treated Rarity like crap for not living her life the way Pearl wanted, and how Sweetie doesn't want to be anything like her. This impresses Rarity enough that she seems to stop seeing Sweetie as an Annoying Younger Sibling and starts treating her kindly.