In this fanfiction, Harry's reaction could be a mix of fear and determination. He has faced many dangerous situations before, but being kidnapped is a new threat. He might initially be afraid, but then his Gryffindor courage kicks in. He could try to outwit Shield Tris. Maybe he pretends to be compliant at first, but then uses a clever spell or trick to turn the tables on her. He could also try to use his knowledge of the wizarding world and its hidden passages to evade her.
Well, perhaps in this fanfiction, Shield Tris is being misinformed. She might believe that Harry is in possession of something extremely valuable, like a powerful magical artifact. So, in her mind, kidnapping Harry is the only way to get that item. It could also be that she's part of a group that has a radical ideology and they see Harry as a threat to their plans, so they order her to kidnap him.
Fury might want to use the 'OP' character's powers for his own gain. Maybe he wants to use their magic to achieve something in his own world or plans.
Maybe because he has some secret plan or info that makes him think it's the only way to protect them.
In some fanfictions, Tony Stark might come to own Shield through his financial power and technological superiority. He could use his vast wealth to buy out the organization or find a way to take over its assets during a time of crisis when Shield is in need of a major overhaul or rescue.
Well, it could be a symbol of protection. In the wizarding world, Harry has faced many dangers. Owning a shield might represent his need to defend himself against the Dark Arts and his enemies, like Voldemort. Maybe it gives him an extra layer of security during battles or when exploring dangerous places.
Kronos might have some minions do the dirty work for him. They could be disguised as normal people and surround Annabeth when she's alone. Then they could overpower her and take her to Kronos. It's also possible that he uses some sort of magic or spell to immobilize her first and then kidnap her.
Harry might struggle and try to break free. He is a brave character and doesn't like being restrained, so he would likely use his physical strength and magic skills, if possible, to get out of Snape's hold.
Harry could be heartbroken. He might isolate himself for a while, not wanting to see anyone or do anything. Just staying in his room, crying and reminiscing about the good times with Edward.
In some fanfictions, Harry might become very angry. He might feel that Ginny is being unfair or not understanding his situation. This anger could lead him to say things he doesn't really mean in the heat of the moment. However, deep down, he's really hurt and confused.
Harry could be initially confused. He might not understand why Hermione, who has always been there for him, is suddenly pushing him away. So he might try to talk to her to find out the reason.