where in "a long way gone" do you encounter the brutal, thuggish, or even sadistic behavior of young rebels?

Commenting on how a rebel soldier had interrogated an old man, Ishmael writes,

“Before the war a young man wouldn’t have dared to talk to anyone older in such a rude manner. We grew up in a culture that demanded good behavior from everyone, and especially from the young.”

The group of boys were also going to behead a five year old boy for his corn.