I picture the scene like this:





Cinder holds Jaune up with her fire like a barrier, she brings him close to her. With her arrogance, she brought him close enough she could rest her hand on his chest. Her hand started to glow on Jaune's chest, no doubt it was heating up. She had an arrogant smile on her face, "Would you like to know the last words your beloved said before I killed her?" She then plunged her hand into him like a flaming spear.



Jaune knew Pyrrha, better than anyone, and he couldn't pass up the opportunity to catch Cinder off guard. He held his cry of pain in with all his might and spat out blood. He then gave Cinder an angry glare, "Do you believe in destiny?"



She was surprised that he knew, her eyes betrayed her of that. She was so shocked that she didn't notice that he just stabbed her in the chest with his sword.



Due to her shock of being stabbed, she pulled her hand out and lowered Jaune. With the blade still in her chest, he pushed her down to the ground and held the sword with both hands, "BECAUSE I DO!" with that last remark, he pushed all his wait into the blade and plunged the sword deeper into her while stabbed the ground below her.



He then stood up, leaving the sword in Cinder's corpse, he walked to the balcony of the battle below. The battle for Beacon had gone as planned, the Grimm and White Fang had been driven form their soil, and Beacon was reclaimed. Jaune smiled and looked up to the moon, "I'll see you soon, Pyrrha." He smiled as he fell flat on his back, and passed away, with a smile on his face.