What is the result of mixing Liver of Sulfur and Hydrochloric acid?

My partner works with metals and make jewelry. He inadvertently mixed Liver of Sulfur and Hydrochloric Acid (both agents do the same thing, faux-oxidizing silver. I know the reaction released sulfur, we can still smell it, but wondered if anyone out there had enough "Chemistry knowledge" to know what resulted in the mixing container? The reaction wasn't volatile but did emit a strong sulfur odor and the liquid turned to a carmel color, murky brown. He kinda freaked and washed it down the drain. Any ideas of what he made, is it dangerous, will it dissolve our plumbing and how do you get rid of the sulfur smell?