When it came to Greek happenings, Anubis didn't feel comfortable or in control one bit. As they saved Annabeth (which was all he fully understood since Nico's mind was so raw and fragile), he had to take over the young boy's body too much. He watched as suspicions rose against him, and in turn, Nico. He knew he was turning Nico's only friends against him but was trying to save his life. When Nico was too hurt or slow to react, he would take over. His accent came out different and Percy Jackson noted that his fighting was very different than Nico's. But it kept his host alive and that was his main priority at the moment.
Maybe the Fates knew that Anubis would take control, maybe not. They were a Greek concept he had yet to understand. He was busy looking into more important things at the moment, like a surprise for Nico after all the fighting had ceased. If the young boy made it through the two wars he had gotten himself into, then he deserved it just as a starving man deserved a bowl of soup. It wasn't a great analogy, but he was never good at those kinds of things.
What brought up the Fates in his mind was the fact that he felt wrong. Every move he made felt like it would splinter the universe entirely. That may have been an overstatement, and he wasn't usually one for such things, but the severity of the situation made him different than his usual self. In reality, all overstatements aside, he had a feeling that what he had been doing wasn't what had been planned. He could almost feel the balance messing up, like all plans had been cast aside as soon as he took control of Nico's fragile body.
That's why he couldn't stop overthinking about that main thing he did, the one thing he did without trying to ask Nico about or thinking over himself. It was a rash decision that he made too quickly, and that would probably change everything that was ever set in place for the rest of the war. The only thing that even remotely comforted Anubis about the situation was the fact that maybe he had the power to change the Fates. Maybe, if they ever decided to cut Nico's string short, maybe he could stop them. Maybe...
He knew the statue was important to the Greek efforts and had gone to help when he noticed that they had it under control. The three boys-Anubis was almost certain of their names: Jason, Frank, and Leo-seemed to be securing it pretty well besides the panic in the situation. Hazel had made it safely to the rope ladder that led up to the Argo II and he had been following suit, cursing Nico's frail body in his mind. The limit to a human was astounding, especially with the injuries Nico had gone through. His ankle was in no condition to be through the stress it was being put through, and the pain radiated in Anubis' mind as the chilling thoughts came. The Fates might be mad at him, but he would never have thought that Nico's injury would mirror Annabeth's so vividly. No one else seemed to notice, but Anubis was sure it wasn't a coincidence. Even though it should have been the last thing on his mind, it stuck out from the others.
He tried communicating to Nico multiple times but finally gave up, deciding that Nico's brain needed some serious rest if it was going to recover from Tartarus with all of its sanity. Nico had willingly stepped back and gave Anubis the reigns to his body, no fight left in him as all he wanted was to stop worrying for a minute.
The least Anubis could do was let him, and he was, in turn, stronger than Nico (especially at the frail state his mind was in), so took full control and decided to help wherever he could. He knew if it had been Nico, his first thoughts would be to save Hazel. So he kept up his pace to the Argo II, wanting to stick by Hazel the entire time. If he let Hazel get hurt, Nico would never forgive him. He would never admit it to the young demigod, but he thought maybe they could be friends. He wasn't used to the modern world or what friends really were these days but he could use someone to ease the loneliness he tended to feel. Sadie was one of these people, but he couldn't be with her often (unless she spent her days talking to him in a graveyard over a random tomb). He would never do that to her, so their interactions were limited.
Hazel's scream of distress broke him out of his thoughts and his limping manner, stopping him right in his tracks as he looked up to see the cause. She was looking behind him towards where Percy and Annabeth had been, next to the large chasm that Anubis knew to lead to that godforsaken place. If he ever had the chance, he'd make it his duty to make sure no one innocent fell to its prey.
When he saw Percy hanging off the edge and Annabeth below him, his whole body filled with dread. Would he really let Nico's friends, his cousins, meet the same fate that Nico had barely escaped? Could he let another innocent be scarred by what was supposed to remain unseen down in that pit?
It took him a millisecond to make up his mind. In one fluid motion, he pulled his staff from his Duat locker (Sadie had happily made it when Anubis asked nicely). He held it out and spoke the Ancient Egyptian words, watching as the hieroglyphics for "levitate" appeared around him. He could hear Percy's shout of surprise and that Hazel's voice had died in her throat, but was too busy concentrating to be distracted. It wasn't a task that could be fixed with simply levitation, not with Annabeth's ankle being drug down by whatever that spider goddess and decided to weave.
"Percy, hold still and don't move," he instructed, closing his eyes for a minute. He had the power but didn't want to channel too much through Nico's body. Him exploding wouldn't be the best fix to the situation. "I have it under control, just stay still for me."
He knew Percy was cautious, as he was smarter than most people gave him credit for. But Percy trusted Nico (or what he thought to be Nico) and allowed his body to relax. This allowed Anubis to think again and break the levitation charm for a minute, using more power to snip whatever held onto Annabeth's ankle.
As it broke, he could feel a piece of what was supposed to be slip away. Going against the Fates may have been fun for someone else, but he didn't want to be noticed by the Greek gods. Not after the lie he had pulled to get to the position he was in in the first place.
As soon as Annabeth was free he brought them up. He watched as Percy's dazed expression melted away, picking up Annabeth as soon as his feet hit the uneven ground. Exhausted but now hopeful, he ran in the direction of the Argo II. Anubis followed his lead and climbed the rope ladder, storing the staff once again in his Duat locker. He silently hoped that nobody had seen the obvious Egyptian magic, but knew that that was too good to be true. He was working with some of the smartest demigods of his age, even while they were fuzzy from pain and exhaustion. He'd have a lot of explaining to do but now wasn't the time, so he climbed on board and watched as Percy did the same with Annabeth. Only once they were in the air did he let himself breath a sigh of relief, and relaxed when he felt Nico's consciousness stirring. He could feel the boy pry through Anubis' memories, making Anubis finally believe that Nico wanted control back. Finally.