One reason could be a misunderstanding. Maybe some villain has tricked Hulk into believing Spiderman is a threat. For example, the villain might have faked some evidence to make it seem like Spiderman was planning something bad against Hulk or his friends.
Maybe Wolverine is being mind - controlled. In some fanfictions, villains use mind - control devices or powers to make heroes act against their will. So, he might not be in his right mind when he decides to hurt Spiderman.
In some fanfiction, Spiderman might hurt the Avengers due to mind control. For example, if a powerful villain like Loki gets hold of Spiderman and forces him to fight against the Avengers, he could cause harm. Another possibility is a misunderstanding. Spiderman might be tricked into believing that the Avengers are a threat and act accordingly.
A recurring theme is his recovery process. It could involve him learning to adapt to his injuries, like if he loses some of his powers temporarily. Also, there's often the theme of the people around him reacting to his hurt state. His friends might try to help him, or there could be villains who take advantage of his weakened state.
He might also use his webs to his advantage. He could try to web up Hulk's hands or feet to slow him down. Or he could create a web shield to block some of Hulk's attacks. For example, if Hulk throws a big rock at him, Spiderman could use his webs to create a net to stop the rock.
In some fanfictions, Tony might help Spiderman by providing him with advanced technology. For example, he could give Spiderman a new suit with enhanced features like better web - shooters or stronger defense mechanisms. This would help Spiderman in his battles against various villains.
Well, in some fanfics, it could be a power struggle within the team. Spiderman might have new powers or knowledge that the other Avengers are jealous of or afraid of. So, they might take actions that end up hurting him, like trying to isolate him or directly attacking him in a fit of rage or fear.
One reason could be a false accusation. If Spiderman is wrongly accused of a crime by the Avengers or someone within the Avengers' circle, he might feel betrayed and lash out at them. He's just a young hero, and such a false accusation could really make him angry.
Well, if we look at such a scenario in fanfiction, it could be a way to give Spiderman a character - building moment. When he gets hurt saving Cap, it can lead to some great internal monologues. He might question his own abilities or reaffirm his commitment to being a hero. And it also gives the author a chance to create some interesting interactions between Spiderman and the other characters as they react to his injury.
In some Spiderman fanfiction, Flash might help by providing an unexpected ally. For example, he could use his popularity or resources to assist Spiderman in a difficult situation. However, Flash often hurts Spiderman in fanfiction too. His bullying nature can lead to Spiderman's self - doubt or put him in dangerous situations, like when Flash's actions draw unwanted attention to Spiderman's secret identity.