In this corner, you have Twp'atwt, who has just been systematically murdering the DIS's prisoners. In this corner, you have Agent Blue Photon, who's been in the dungeon for months. Guess which one inflicts an Eye Scream on the other. Hint: It's not Twp. Seven years later, they fight again, and it's even more of a Curb-Stomp Battle when Twp loses his other eye and the text implies that he istorturedto death.
Speaking of Dafydd, he ended his career by taking on two Legendary Badfics (the So Bad, It's Good "legolas by laura" and the horrifyingsquick-fest "Celebrian") in a row. After he completely flips out with a confiscated Suevian Artifact of Doom at the latter, accidentally killing himself in the process, his girlfriend Constance Simms gets her own awesome points for marching into the Halls of Mandos and chewing out Mandos himself until he brings him back to life.
Agents Kirill and Zug managing to overcome the influence of a Wraith that was amplifying their resentment of each other and driving them to try to kill each other, with the power of love.
This one counts not just because they took down a horribly-written Grim Dark fic in a seriously impressive way (that's par for the course with the PPC), but because the canon itself was fighting back. Because My Little Pony: Friendship Is Magic is very recent, very popular, very well-written, and has a lot of positive emotions tied up in it, the continuum almost killed the fic by itself. Not too bad for a show about ponies. And the mission's extra-long dénouement is a Crowning Moment of Heartwarming as the canon characters' true equinalities resurface.