Jump, deposit a nice flammable package, exit the area.
Might work?
But for the recent events it kind of looks like the work of a swarm of fireflies?
Or just infiltrate and leave a “Film Noire” timing device with some combustibles.
https://www.interfire.org/res_file/mmo2.asp
3. Cigarettes
Key facts:
the lighted cigarette in the waste basket is a source of accidental fires from carelessness;
more effective in combination with other flame sources;
commonly found with matches.
(The lighted cigarette is placed between two layers of paper matches in a matchbook. When it burns down to the head it will ignite the matches and the book will burst into flame.)
;another variation: tying matches around the outside of a cigarette which burns down to the match heads. (This device is fairly resistant to burning to completion, especially the match book. Thus, its remains can be found by careful examination of the point of origin. This is among the most commonly used delay devices in grass and wildland fires.)
(Of course it never hurts to help things along with a magnesium flare.)