I'm in the brain storming process before the writting and need about twenty minutes of realistic War fighting. I was wanting to put a couple explosions in from grenades. I know of different ways to combine small explosions in front of a blue screen and inserting them in front of the person,But I'm not sure if I want to go that route. Does anyone know of a way that would be legal and safe. It would have to have debree, rocks, dirt, grass ext... in the explosion because it's outside.