After the initial shock and anger, she would start thinking rationally. Annabeth is known for her strategic mind. So she'd start observing the situation, looking for any weaknesses in the captors' setup, any tools she could use to her advantage, all while trying to keep Percy's spirits up during the torture.
Annabeth could be annoyed. If she doesn't understand why Percy is staring, she might think he's being rude or wasting time. So she could give him a sharp look or a sarcastic comment to snap him out of it.
She might be initially very angry. Annabeth is intelligent and perceptive, so she would likely feel betrayed that Percy thought he could deceive her. For example, if Percy lies about a mission, she could find out the truth later and confront him immediately, demanding an explanation.
In the long run, Percy might grow from the experience. He could become more cautious in his relationships and less trusting. Or, if there's a chance for redemption in the fanfic, he might be open to forgiving Annabeth if she shows true remorse and has a valid reason for her actions. But initially, it would be a very difficult and emotional time for him.
Perhaps Percy's torture makes Annabeth realize the depth of her feelings for him. Before, she might have been unsure or in denial, but seeing him in such pain makes her confront her emotions. This could lead to a more intense relationship between them once Percy is saved. For example, she could be more open and affectionate towards him.
She might be really surprised at first. I mean, if it's unexpected, she could just stand there for a moment, not knowing what to do. Then she might blush a lot because she's embarrassed that it happened in public. But deep down, she could also be really happy that Percy made such a bold move.
She would likely be furious at first. After all, it's a huge invasion of privacy.
She'd probably be shocked at first. But then her face would light up with joy. After all, she and Percy have been through so much together.
Percy might be a bit flustered and embarrassed. He's protective of his relationship with Annabeth, so having Magnus walk in might make him feel like their privacy has been invaded. He could quickly try to shield Annabeth or just look really shocked.
At first, Percy would likely be angry. He's a fighter, and being betrayed by someone he loves would fuel his rage. He might go after Annabeth to demand an explanation. But as the reality sinks in, he could become very sad and withdrawn. He might isolate himself from his other friends as well, feeling like he can't trust anyone anymore. He would constantly be thinking about what he did wrong to make Annabeth turn on him.
He would probably be shocked. Percy has always trusted Annabeth, so being stabbed by her would be completely unexpected. He might initially be unable to believe what's happening.