Okay...I can imagine a scenario with this interpretation of Yang:



Yang is lying back on a tree, moping as usual. Shattered. Hollow. A shell of her former self. Suddenly, a bomb comes in and blasts in the distance. Yang gets up and decides to run to where it is. What she saw causes her eyes to widen in shock: the White Fang are attacking Patch. Multiple people are either killed or wounded, many buildings set ablaze. But most heart-wrenching if them all for her is the sight of Taiyang, a massive slash wound from his lower right back to his left shoulder. He's passed out, but the position he's in makes her think the White Fang killed him. She slowly lowers her head, her world becoming more broken then it is. She suddenly starts getting flashes. Herself being surrounded by Atlesian troops after being framed at the Vytal Tournament. Penny being bisected. Vale in ruins by the Grimm. Pyrrha being shot in the heart by Cinder. Yang's arm being cut off by Adam. Finally, a single solitary figure within a wildfire. The figure looks behind them. The figure is Blake, a somber expression on her face. During the flashes, Yang gets angrier and angrier. After she sees the flash with Blake in a wildfire, she snaps. Her eyes snap open, glowing an intense red. She then lets out a roar of rage that would put even the most beastly of Grimm to shame, some of her rage manifesting into a monster-like right arm. The White Fang spots her, and attempt to capture her. They end up brutally murdered instead. Yang stands in a puddle of blood and guts from the White Fang members. She looks down at her right arm. As she looks at it, she realizes that her spark has been reignited. She then says, "My fire...it's been reignited. I burn again." She looks up at the distance from the shore of the island, then says, "And soon, all of you...the mother who left my family behind *Flash of Raven*...the man who framed me *Flash of Mercury*...the woman who destroyed Vale *Flash of Cinder*...the bastard who cut my arm off *Flash of Adam*...and you...Blake...YOU ALL WILL BURN WITH ME!!!", the last six words hollered out in primal rage. She is neither the cheery, fun-loving girl she was, or the moping depressed girl she was, but is now a wrathful, enraged, and cynical girl. Nothing, not even her friends and sister, can stop her vengeance. She will have it one way or another.