Injections of the normal sort do not typically entail the smell of sulfur and the *thwap* that could be only one thing. At the very least, there was the sound of a clean needle. Sounds like these throw me off for a few moments as I ponder the life of a random junkie. This person was not under a bridge or elsewhere outside. My gut is that the person holds down a steady job and is being destroyed by a major addiction.