He doesn't stick to one voice the whole time, he changes it a lot to get his points across. For example, at the beginning of the poem he states: “The whiskey on your breath could make a little boy dizzy; but I resisted like a dead man: it is not easy to dance such a waltz." Only in this sentence does it go from “boy” to “I” in the second sentence. I believe he did this to further demonstrate that the boy does not believe he was beaten. He seemed to say little boy as if he wasn't the son because the son continues to deny the fact that they aren't just playing. Then the son comes back to reality and realizes that he is the one holding on for dear life and that they are not just playing. The last two lines of this poem are a bit like the son's last thoughts about the fact that his father still loves him. He says, “Then you waltzed me into bed, still holding on to your shirt.” As you can see, the son still considers it a dance, as if the father has been playing with it all this time. Now the father and son don't play anymore and since he is all settled, the father is kind and takes the son home.