I can barely understand with the lack of punctuation and details in your replies :/
Create two variables in what?
How does any of this involve the FireDestroy sprite?
For some reason, I'm unable to choose Particle - On collision with object, the option isn't there, so the only way to do this is to test collision with a sprite that is pinned to the particles.
But, when I make an event "FireDestroy on collision with TileMap - Set 1 to instance variable; explode on Fireball 1 and Fireball 2" it applies the variable to every single particle's instance variable currently on the screen.