Why does cory has the rage to fight shawn and eric in season 3, he even has the rage to fight the boy topanga was dating in a season 3 episode where he jumps on his back ???

https://www.youtube.com/watch?v=n3eJkf4erbI
https://www.youtube.com/watch?v=n3eJkf4erbI
https://www.youtube.com/watch?v=n3eJkf4erbI