The team creates an entire story/scene in reverse, starting with the conclusion of the story and improvising their way to the beginning.
The team must know the “Basic Scene Structure” so well they can forward the action in reverse (I guess that would be “reverse” the action). Resolution, raising the stakes, problem, characters, environment. Example: “I’m leaving – goodbye forever” “What will you do now?” “I can’t take this anymore!” “Nothing’s ever good enough, is it.” “God, how I hate carrots!” “Here’s your dinner, hon.” “Isn’t dinner ready yet? I’m diabetic.” “Welcome home dear, have a seat. I’ll just be a minute.”
You don’t have to speak backwards – just unfold the story in reverse order. Take your time: this game is liable to disintegrate entirely if it’s rushed.