He is talking about someone that has recently recovered from a drug addiction; with them recovering they get very self-righteous, and he wants to know how they are going to go about correcting the life's that the person has wronged during their addiction to a drug or something of that nature. The halo represents the action of trying to correct your wronging and the halo being pulled into a noose meaning that you are no better than before when you were on the drug and you are pulling yourself back into your same mistake.