"Where... Where did Jack go? Was it Chuck? Did he do it?" — Sam asked, turning to his brother. He expected Dean to look powerless and broken, but he actually looked furious.
"Get Jack back, you son of a bitch!" — Dean shouted.
Suddenly brothers heard a voice from the corner of the room.
"I'm surprised the bunker is still intact. Billie, huh? Well, they do say that death comes when you least expect it. So, Dean, what was that you were yelling? Sorry, I was a teensy bit busy with annihilating your friends. Couldn't look at what you were up to. Well, and the rest of humanity. It is done now. You should be happy I did it, boys. This Earth is going to be destroyed, too, so it's better for them to just... stop existing. Just like that, with a snap of my fingers, quick, painless, clean. No heaven, no hell — I turned them into nothing. Erased them from existence. Now it's your turn. Saved the best for last." — Chuck looked perfectly calm this time. Sam noticed that one of his eyes turned brown.
"You... It's all because of you!" — Dean's eyes darkened. His gaze held something that Sam could only describe as wrath. Pure, unrestrained, divine wrath which was almost visibly radiating from his brother.
"You killed humanity. You killed my friends. You killed my family. You killed... You killed Cas! You let him die, you were the reason of all this! I, no, Cas and I, already killed Death, and now I'll do my damndest to kill you. I know that bullets won't really hurt you, and I know that this is probably the end for us. But remember this, you dick: you never broke us. You failed. You are a failure. You couldn't make two tiny ants do your bidding, and if I'm gonna die, then I'm gonna die free. That's what he would want. I'm not only fighting for love as he said. I'm also fighting for freedom. And guess what — I already won, even if you vaporize me to atoms. Your hamster wheel is broken, you puny, pathetic little god. So, screw you, Chuck. You lost your favorite toys." — each word sounded sharp, like a bullet, and each word held such immense power. It felt like Dean was reading a spell to banish evil. But still, Sam was surprised with how softly Cas' name sounded amidst this string of pure wrath. Dean's pain was so evident, so corporified, that Sam felt his own insides writhing and burning.
Chuck's calm attitude changed. He looked at Dean like he spit in his face. Sam felt like Dean's anger was contagious, and it somehow got God himself infected.
"Oh, so your favorite angel is dead now, huh? Well done Billie, never thought I'd say it, but she managed to surprise me in the end. Just not in the way she expected. The plan was stupid from the very start. What can a bunch of — what did you say, Dean? ants? — yeah, a bunch of ants, I like how it sounds, so what can a bunch of tiny, pathetic ants do against me? You're nothing, and you'll turn to nothing." — Chuck raised his hand to click his fingers, but Dean quickly drew his gun and shot him in the head.
"Now you made me angry! Why do you have to be so… meddlesome?! So disobedient? You know what? I know what I'm going to do. I'll squeeze your life out of your body. And then I'm going to turn your soul to atoms, Dean. Who knows, maybe you'll join your beloved angel and the rest of your friends in the Nothing you'll go to, if such a place exists!" — with these words Chuck lunged at Dean and started strangling him.
Before running to try to stop God himself, readying himself to die trying, Sam got a thought that stopped him dead in his tracks: Chuck didn't know that the Empty existed! What if… What if the Empty could kill him? Or capture him at least, imprison him? God wasn't interested in the great Nothing. He was interested in creation at first, and then — in destruction. But how could he call the Empty? What could he do to bring it to Earth? Suddenly Sam noticed a book on the table. The book of Death about God. It seemed to be missing a little piece in the corner. Jack probably took it with him when he disappeared along with the part of the room and the table the book was lying on. He could open the book! His time was limited because Dean was close to losing consciousness, but what other choice did he have? And so, he looked at the last page. His eyes widened, and then he screamed at the top of his voice:
"JACK! JACK! WE NEED YOU! COME HERE!"
Then everything stopped.
Chuck dropped Dean and turned to Sam, and then saw Jack standing in the middle of the room, holding… Death's scythe? Jack looked as surprised as Chuck and Dean, eyes wide, mouth open, just standing there. But Sam had no time to explain. He knew what they needed to do.
"Jack! You can kill him with the scythe now! You can hold him! You got new powers, believe me, so fucking use them!" — Sam shouted hurriedly.
Chuck looked at him and chuckled.
"You think this powerless boy could kill me, Sam? Really? You're grasping at straws now. This is what pathetic looks like, Dean." — he said, appearing next to Jack, grabbing the boy by the neck and lifting him in the air. Chuck took the scythe and threw it away. Sam noticed Dean slowly moving towards the scythe, but Chuck did, too.
"Where are you going, Dean? We're not done yet!" — God said, and suddenly Dean's throat was in his other hand, and Dean was lifted in the air along with Jack.
Sam calmly approached Chuck and stood in front of him.
"This is your last chance. I'm warning you. Despite what you did, you are God. You created it all. You created us. You can stop and leave." — Sam said, quietly, but firmly.
Chuck looked genuinely surprised. "Wh… What, Sam? Why are you telling me this? I can snap their necks in a second, and then snap yours, and it'll be bye-bye forever, Winchesters. Is this a joke?" — he smiled and laughed, loosening his grip on Jack's throat and getting distracted. Just what Sam needed.
Jack shifted his hand a bit, and black goo started flowing from it, quickly reaching the scythe and pulling it towards the boy. Chuck was too late to notice it. Jack took the blade of the scythe in his hand and plunged its deep into the chest of the still laughing God. Chuck's hand holding Dean's throat unclenched, and Dean took the blade of the scythe and plunged it even deeper.
"Even God gets reaped." — Dean said and smiled while Chuck was dying. Sam expected it to look like an angel dying, a lightshow or something even worse, but Chuck died as a human. He stopped breathing, his mouth fell open, and his eyes went still. God was dead.