He had pulled up his music player, a song whose name I couldn't read outside of the numbers '1800' at the end being shown. The album art was of another human, standing on top of an incomplete star on a golden background. According to the small white bar, he was about halfway through. Then he took his finger and moved the bar back, rewinding the song to the beginning. After doing so, he carefully lowered himself down into a sitting position in a way that would put as little weight on his ankle as possible. I got the meaning almost immediately.