Reading Lesson with Carter

I have been very slowing working with Carter on learning to read. We do a few sounds and words each day. Everyday as he read through his word list, he would read the word MEN and then make the sound BRRRRRRRRRR (kinda like a machine gun). He did every time and each time I would say to myself, "What is he doing." Finally after a few weeks, I asked him what he was doing. He turns to me and says, "That is what men do in battle!"