Do you remember the photos of molten aluminium alloy car wheels melted down while plastics nearby were completely intact, and the way that certain kinds of things appeared to have basically exploded, during california "wildfires".

I know that part of the california thing had to do with the sheer amount of australian Eucalypt trees that had been planted, and these trees are adapted to and depend on a periodic fire regime to reproduce properly, and the vapors off the leaves can form a fully combustible gas mix that can explode like gasoline. While this is part of it, it just doesn't explain the molten metal with nearby plastics unaffected. That can only be caused my microwaves, which pass through plastics but agitate metals.