When Ender kicks Stilson when he is on the ground, he is breaking the unspoken rules of 'manly warfare' how does this show indirect characterization?
The novel takes an omniscient perspective opening outward from Andrew Wiggin's (Ender's) perspective, but it is punctuated by conversations between characters who are at first unknown. As the novel opens, two characters are discussing a boy and his older siblings. One says, "I tell you, he's the one." The other voice is not as sure, but he acquiesces to the first's request to "take him," because they're "saving the world, after all." Already we learn of "the buggers," or Formics, the alien enemy.
Andrew (Ender) Wiggin has been wearing a "monitor" that permits the authorities to understand his experiences from the inside. He has it taken out on the day that the book begins. Ender is extremely smart for a young boy. For instance, he understands that the nurse is lying when she says that the removal of the monitor will not hurt. He is also very cynical about such things: "Sometimes lies were more dependable than the truth." Ender turns to inner discourse about whether his brother Peter will stop hating him now that Ender is without the monitor. But Ender decides that Peter will never leave him alone.
During the monitor removal, Ender feels intense pain. He needs a shot to stop the pain and muscle spasms, and the doctor is angry that "they" left the monitor in for so long. Eventually, the drug wears off. Ender keeps looking around for something without remembering what he is looking for.
When Ender returns to class, the other kids whisper about the fact that his monitor has been removed. After school, several of the kids, including the lead bully, Stilson, taunt Ender. Soon they physically attack him, but Ender manages to manipulate Stilson into fighting him alone, playing off his pride and taunting, "it takes this many of you to fight one Third?" (Ender is the third child in the family, and Thirds are looked down upon.) When the others back off, Ender kicks Stilson, taking him by surprise, and drops him with the kick. Then, Ender walks up to him and kicks him several more times, making the point that he will win decisively so that no bullies will attack him again--the others will be far too afraid of Ender to try anything. After the fight, Ender sits down and cries until his bus comes, afraid that he is becoming vicious like Peter.