The Patient is accepting the fact that he's doomed to hell and is playing with several religious ideas(Contrition, ashes to ashes, hallelujah, praise etc.) Walk like the devil means he needs to know how to act like a demon because he's going to hell, if he acts like an angel he won't be left alone by hell. Hiding in the alley is telling him to leave, he'll never get home. The blood and the halls is a reference to a hospital.
The Patient is accepting the fact that he's doomed to hell and is playing with several religious ideas(Contrition, ashes to ashes, hallelujah, praise etc.) Walk like the devil means he needs to know how to act like a demon because he's going to hell, if he acts like an angel he won't be left alone by hell. Hiding in the alley is telling him to leave, he'll never get home. The blood and the halls is a reference to a hospital.