I agree with the other people that there's likely no harm done to the regulator. I was at an IQ conference (the Sixth International Conference on Underwater Education) in the 1970s where a Dacor engineer, who was quite experienced, actually recommended submersing the regulator, cap off, in fresh water after a salt water dive. He stated that the fresh water would do no harm to the inside of the regulator, and it would remove the salt water mist from the regulator, and from the inside. He also recommended purging it afterward for a good amount of time to dry everything out.
However, I would get your regulator serviced, and charge the guy for it. This kind of foolishness needs to be tamed somehow, and what better methodology than hitting the pocket book.
Tell this idiot that there have been a number of deaths from people trying to breath HP helium for the speech effect, and embolizing. No matter the gas, this is a dangerous practice.
SeaRat
However, I would get your regulator serviced, and charge the guy for it. This kind of foolishness needs to be tamed somehow, and what better methodology than hitting the pocket book.
Tell this idiot that there have been a number of deaths from people trying to breath HP helium for the speech effect, and embolizing. No matter the gas, this is a dangerous practice.
SeaRat