This is a scene I originally planned for chapter 31 in the middle of the battle on Hélgidomur. I don't remember why I decided against writing it that way but I am quite fond of the exchange between Loki and the Avengers, so I am gonna share it with you. The last part I pretty much used exactly like this in the final version but I will leave it here anyway.
"Let me create a reality where his minions are collectively immobilized," Loki mumbled as he tried to decimate the titan's army with the magic of the Reality Stone but to his great dismay, nothing happened.
"Is the Stone too weak or are you too weak?" Valkyrie enquired breathlessly, her eyebrows shooting up.
"I suppose we are both a little exhausted," Loki conceded.
"This is about the worst time to get exhausted," Stark pointed out unnecessarily. "Just do something!"
Loki trawled through his mind for the possibilities and eventually said, "I suppose it is time for what you mortals call plan B," as he summoned a golden dome around them that was similar to the shield that used to protect Asgard from the attack of its enemies.
They all sighed with relief before they started firing suggestions at each other, one of which was to just summon the Bifröst to teleport them all back to safety.
"No." Loki shook his head. "If we do that inside of this dome, its energy might fry you. If we do it outside, we might teleport his whole army with us and, truth be told, allowing the enemy access to the Rainbow Bridge is a mistake I would rather not repeat," he said sourly.
"How mature of you," Valkyrie noted.
"Why, what happened?" Pepper asked.
"Long story," said Thor. "But it hardly matters. We are here now and we are all together. Let us finish this son of a bitch."
"I am not trying to be overly pessimistic here," said Stark, "but last time, there were six of us against him on Titan and we still lost. Now it's twelve of us against his entire army. How do you suppose we win?"
"Last time, he had four Infinity Stones," Nebula reminded him.
"Now, he has none and we have two," Valkyrie added. "The luck is on our side."
"He has an army," Shuri gasped.
Unable to resist the urge to allude to their conversation on Stark Tower all those years ago, Loki jested, "And you have a Hulk. Well, half of a Hulk. A metal Hulk."
"Oh, shut the fuck up," the engineer grumbled just as Bruce snorted a mortified, "Thank you very much."
"Come on, Stark, you are the norndamned Avengers, are you not?" Loki went on, his lips curling into a smile as his gaze slid to Rogers, then to Bruce, then to Barton and the Widow. "Since when do you flinch from an army? You fought the Chitauri in New York. You fought Ultron's army in that forsaken Slavic country. You fought the Black Order in Wakanda. Why do you falter now?"
Because of the traumatic aftermath of the Snap, probably, his inner voice replied.
The Avengers stared at him in genuine confusion but Thor rewarded his little brother with a proud smile. "Loki's right. Let us fight, my friends."
"Hell, yes!" Rocket exclaimed.
Rogers and Stark nodded their hesitant agreement.
Loki giggled softly. "I guess it is 'Avengers Assemble' for you, then!" he shouted in Captain America's voice.
Rogers blew out an annoyed breath but said nothing. They all moved into position, forming a circle. Thor wielded his axe, thunder crackling all around it. They all positioned themselves in a circle, aiming their weapons at different spots outside the shield.
"Alright, drop it, brother," Thor demanded and they all surged forward into battle.
[...]
She stormed towards her adoptive father in a fit of rage and Loki took off after her. Thanos fought off Nebula's attack with his giant sword and then grabbed her by the neck, lifting her off the ground with his giant purple hands as he had done with him on the Asgardian refugee ship.
"Let her go!" Loki screamed, firing another blast of Reality Stone magic at him. The titan staggered under the impact and released the grip on his daughter, who slumped to the ground with a hollow thud.
Thanos scrunched up his nose. "You think you are a worthy opponent now?" he spat. "I can still smell the fear on you, Asgardian."
"How many more times do you have to pry open my mind before you understand that I am not Asgardian?" Loki growled and hurled a wave of water against him that froze him into a cocoon, leaving only his head sticking out.
Thanos hissed and struggled against it, cracking the ice. The more he struggled, the more water Loki hurled into his direction, thickening the blanket of ice until Thanos could no longer move. "In contrast to you, I have changed! I found self-acceptance. You are still delusional, thinking yourself a God when all you really are is a disgrace!"
Next to him, Nebula had risen to her feet, her fingers tightly curled around the hilt of her sword. When Loki nodded towards her, the cyborg lunged forward with a yell, pulling the weapon over her head. "This is for Gamora!" she howled as she drove the blade deep into her father's throat, right through his Adam's apple.
Loki stood mesmerized, watching Thanos struggle, his face warping with pain and terror for a few agonizing moments before the spark of life in his eyes finally went out. Tears of relief sprang to Loki's eyes and he felt a weight lifting off his chest. The sensation made him so dizzy that he sank to his knees. He heard Nebula dry-heave next to him but did not find it in himself to look up. It was over. It was finally over.
Well, actually, it was not truly over. Behind them, the Avengers were still facing the titan's army and none of the Chitauri looked remotely tired.