"Break Impact object: RayFire Tool will fragment and brake Impact objects on their first collision with Inactive or Unyileding objects.
Turn this Off if You want to brake only Inactive objects

Break Inactive object: RayFire Tool will fragment and brake Inactive objects on their first collision with Impact or Unyileding objects.
Turn this Off if You want to brake only Impact object"

5.2 Reactor Demolition. Sourced from: http://www.mirvadim.com/onlineHelp/5_2_Dml.html