One reason could be a fight with a powerful enemy. Maybe a new super - villain has emerged in the city and Peter underestimated their strength during the battle in the alley.
Peter Parker lay in the alley, blood seeping from his wounds. His suit was torn, a result of the intense battle he had just endured. The dim light of the alleyway flickered ominously as he tried to catch his breath. He could feel the pain coursing through his body, but his mind was still focused on the threat that had escaped. 'I can't let him get away...' he muttered to himself, trying to summon the strength to get up and continue the chase.
In some fanfiction scenarios, Peter might be dealing with some sort of internal power struggle. If his spider - powers are evolving or being affected in some way, it could lead to his collapse at school. For instance, if there's a glitch in his powers that causes his body to have sudden energy drains or physical reactions, like collapsing, while he's at school trying to act normal.
One possible reason could be extreme stress. Peter Parker has a lot on his plate, being Spider - Man and having a normal life. If in the fanfiction he faces a series of really tough situations like failing to save someone important or being hunted by a very powerful enemy, the stress might get to him and lead to self - harm as a way of coping. Another reason could be feelings of isolation. Even though he has friends, he might feel like no one truly understands the dual life he leads, so in the fanfiction this could drive him to such a desperate act.
In some fanfictions, it could be that he has made a big mistake. For example, if his actions as Spider - Man led to the harm of an innocent person. He would be so guilt - ridden that he decides to run away from everything, including his friends and family in Queens.
Well, one reason could be that he's on a secret mission for S.H.I.E.L.D. that requires him to go undercover and cut off all contact. Maybe he's investigating a new super - villain threat that's too dangerous to let anyone know about.
His double life is also a big factor. Constantly having to balance being Peter Parker, a normal student, and Spider - Man, a superhero with great responsibilities, can be extremely taxing. He might feel like he can't be fully himself in either role, which can cause a sense of isolation and ultimately depression. In fanfiction, this can be shown through his inner monologues and his interactions with others.
Maybe it's due to a new and powerful enemy's attack. In fanfiction, authors might create unique villains with abilities that specifically target Peter's weaknesses. For example, if the villain has the power to disrupt Spider - Man's enhanced senses, it could cause Peter to be disoriented and ultimately collapse. Another aspect could be that Peter overuses his powers without proper rest, which exhausts his body and causes him to collapse.
One possible reason could be overexertion. Peter Parker is often depicted as taking on a lot of responsibilities both as Spider - Man and as an Avenger. He might be pushing himself too hard in a fight or during a mission, leading to a collapse. Another reason could be some sort of external attack that affects his physical or mental state, like a new type of villain's weapon that drains his energy.
One possible reason could be that Morgan gets more attention from Tony Stark. Peter Parker sees Tony as a mentor and father figure, and if Morgan is getting all the love and focus from Tony, it might make Peter jealous. For example, if Tony is spending more time teaching Morgan new things or just being with her while Peter feels left out.
One possible reason could be envy. Flash might be jealous of Peter's intelligence or popularity at school. Maybe he feels overshadowed by Peter and his achievements, so in the fanfiction, his anger and frustration lead him to lash out physically.