From the introduction:
Tabletop games are exciting and fun, and can explore adventures we otherwise might not have. However, they can approach topics that some people aren’t comfortable with. Some people might want to play a grittier game that digs deep into the grindhouse style of action, or one that has sex and romance that’s detailed and intimate, while others might want to have the gore and guts or sexual content happen off-screen.
Sometimes, we aren’t ready when this happens. Sometimes people don’t know all of their boundaries yet. Maybe they do, and they just aren’t expecting to kick down the door and find something that really makes them scared, or uncomfortable. This is where Script Change comes in.
The core Script Change tools are called rewind, fast forward, pause, and frame-by-frame. There are also some additional tools related to Script Change: the highlight reel, instant replay, and wrap meeting, discussed later in this document.