One night, the Commandant summons Agu to his quarters and rapes him. Strika, another of the Commandant's rape victims, comforts him. ... While the soldiers (except for Agu and Strika) spend the night with the brothel's women, one of the women fatally shoots Two I-C.

What did the commandant do to AGU in the room?

At one night, The Commandant lures Agu into a room, saying that he favors Agu, and proceeds by raping him (he is implied to do this to the other child soldiers as well, such as Strika).

What happened to Agus mother in Beasts of No Nation?

As his mental state deteriorates during his time in the Commandant's service, Agu mistakes a woman for his lost mother, clinging to her in a sudden — and given the scene, shocking — regression to childishness. ... Agu shoots the woman while she is being raped.