Simulating the injury of an actor with a cutting weapon is a fundamental operation for an action film... and thanks to Kdenlive we can produce a decidedly realistic computer animation without risking to harm someone.
The "time freeze" effect, typical of action films, can offer exceptional results. And it can be made without expensive equipment: a modern camera, GIMP, and of course our trusty Kdenlive are enough.
Kdenlive is able to detect the movement of an object in a two-dimensional video: and we can take advantage of this function to avoid manually building all the key frames of a "composite" transition. Great for making gunshots or stains appear on a wall.
Can an actor be kicked from one part of a room to another without being Chuck Norris and without really causing serious injury to the "victim"? Of course, just mix the GIMP photo editing with the Kdenlive editor, and you're done.