There’s one Apple TV feature that truly makes the viewing experience a lot easier and more convenient. If you’ve missed a piece of dialogue, you can hold down the Siri button on the remote control and ask, “What did he/she say?”Siri will then rewind your TV show or movie by 15 seconds, turning on closed captioning until the show or film has reached the point where you initially asked the question.
Source: This Is the New Apple TV’s Single Best Feature | TIME