The video below is lengthy but it is worth watching because it provides clear examples of the differences between how fires started by microwaves burn and brush fires burn. The expert implies that 35 of the 38 fires he studied were started by Microwave and Laser types of DEWs, Direct Energy Weapons. Some examples include cars with hoods and engines completely melted, trees igniting and burning from the inside out, and fences that burned only around where nails attached barb wire to them. The concept is comparable to accidently microwaving something that still has metal attached to the container or accidentally microwaving a metal pot.
plasma fire experts showcase how this fire defies laws of physics