Videomaker – Learn video production and editing, camera reviews › Forums › Technique › Miscellaneous Techniques › Editing with fire (should I use a mask?) › Also, if you want the fire
Also, if you want the fire to have more of a "window reflexion" type of look, use the "screen" compositing mode. It cuts out black. Using this and manipulating the opacity, you could probably end up with a great looking effect.