Real epic win? Nanoha spams one two many Starlight Breakers, and dies. Epic heroes' funeral, everyone pours man-tears.
Everyone takes it really hard, but the one who can't deal with it is...Raging Heart. Refuses to obey any other master, and is put into sotrage. After several years, everyone is able to start moving on with their lives, except for Yuuno who goes emo and is caught spending days on end in Ferret form, not sayig a word to anyone. One day, he breaks into Raging Heart's storage area, intent on getting clues as to Nanoha's whereabouts as he has convinced himself she's still alive and in hiding somewhere. Raging Heart, having itself gone insane, seizes on Yuuno's madness and convinces him of a plan to get Nanoha back...from another dimension. This would make them high-level criminals, but they don't care.
So Yunno comes out with Raging Heart in hand, which is taking his lifeforce as an accelerated rate in order to increase its power level, and they go on a rampage, beating down mages and draining their linker cores so that they can blow a hole in the dimensional fabric and enter a parralel dimension in which Nanoha would still be alive.
"Raging Heart...are you sure? Fate is Nanoha's best friend...she would be sad..."
IT HAS NO IMPORTANCE