At the end the one who was shooting says "pretty fun". Well, I was shocked by the fact that the one spectator close by didn't use hearing protection. Maybe ear plugs tucked in ears, but if so, they were well hidden.
Anyways, hazardous to say the least.
Before acquiring tinnitus, I don't know if I had paid attention to the missing muffs thing. Maybe, maybe not.
PS. I uploaded this clip to YouTube, this was cut from a Finnish reality show "Paratiisi", currently airing on a local channel. It follows Finnish tourists, tourist guides and diving instructors in Thailand.