Why did ender brutally beat up the bully in enders game?

Ender Wiggin brutally beat up the bully, Stilson, in "Ender's Game" to assert his dominance and prevent future bullying. Ender understood that if he didn't make a decisive statement, he would always be targeted. His actions were driven by a mix of survival instinct and a desire to deter further aggression, reflecting the harsh realities of his environment. This incident foreshadows the intense moral dilemmas he faces throughout the story.