At battle school, they give Ender command of an army.  They revive the old Dragon army (which was discontinued because no Dragon army ever won even a third of its games).  He goes to his new barracks and sees that none of the soldiers have much experience in the battleroom at all.  Most are fresh out of their launch groups, and many aren't even supposed to be advanced to an army yet. 

    When the go to the battleroom for practice, he gives the "the enemy's gate is down" lecture, and sees that one particularly tiny boy (called Bean) is catching on quick.  Ender singles him out, making Bean appear smarter than the other soldiers (which he probably is), doing exactly the same thing that the teachers did to Ener when he first came to the school.  He lectures them on his basics of fighting, and makes them all hate Bean a little more by having him answer all the questions.  They learn quickly, and he is grateful to the teachers for giving him a group that learns quickly.

    He stays after to help some of the younger kids with technique, and Bean corners him on the way back.  Bean corners him and tells Ender to give him a toon.  Ender laughs and tells him that until he proves himself, Bean's not going to get anything.

    That part made me think about how in doing this, Ender may seem mean, but he's really just trying to get Bean to exhert himself.  Ender had to work for everything that he ever had at this school, and now he's showing Bean that unless you can do it for youself, you don't really deserve it.