Which line from "Lather and Nothing Else" best shows the resolution of the barber’s inner conflict?

“They told me you would kill me. I came to find out if it was true.”
I don’t want to stain my hands with blood. Just with lather, and nothing else.
A little more lather here under the chin, on the Adam’s apple
And it would be so easy to kill him. He deserves it. Or does he? No!