The only time my neighbor starts a fire in their back yard is when there is a red flag fire warning. We don’t have many of these warnings per year, like one or two. On these days, they have a fire without fail. Yeah, they’re a libertarian. Loves Rogan and Musk. Fucking dangerous, these people. Adolescent contrarians have more functioning logic.
I’d still call and ask if they could knock on his door. Keep “discouraging” him until he gets it.
Have other neighbors also call in and ask for help.