One possible reason could be that Tsukishima is under some sort of mind control or influence from a more powerful and malevolent force. Maybe he has been deceived into believing that Ichigo is a threat to something he holds dear.
Ichigo might initially be in shock. He could be unable to believe that Tsukishima, who might have been a friend or at least an acquaintance, has turned on him.
Angst fiction, well, it's basically about exploring the darker and more troubled aspects of human emotions through fictional stories. For example, a story might be about a young person struggling with self - identity in a cruel society. They face a lot of angst because they don't fit in and are constantly at odds with themselves and the world around them. It can be a very powerful form of storytelling as it delves deep into the human psyche.
Angst fanfiction is a type of fan-written story that focuses on intense emotions, often including feelings of anxiety, stress, or inner turmoil for the characters.
Angst fanfic is all about highlighting the darker, more emotionally intense aspects of the characters' lives. It can involve heartbreak, trauma, or difficult situations that cause them a lot of emotional pain. The aim is to evoke strong feelings in the readers.
Tsukishima's back story has a lot to do with family influence. His brother's success in volleyball was a big factor. He was in his brother's shadow for a long time. As a result, he was hesitant about volleyball. But as he grew in the Karasuno team, he started to find his own identity in the sport, separate from his brother.
In fanfiction, 'angst' often refers to a feeling of deep emotional pain, distress, or anxiety. It can involve the characters going through difficult situations like heartbreak, loss, or internal conflict. For example, a character in a fanfic might experience angst when they lose a loved one or when they are faced with a moral dilemma that tears them apart inside.
An angst fanfic about 2jae might focus on the complex and often troubled emotions between the characters. It could explore themes like unrequited love, misunderstandings, or internal struggles. For example, the story might show how one character has feelings for the other but is too afraid to express them, leading to a lot of emotional turmoil.