Going to the gym with a partner gives you someone to talk to and ask questions of, but Duel is learning how to become a better training partner yourself. So, when it's your turn to spot, it's your responsibility to keep a proper 1-2-3 count, keep your partner safe, and make sure your partner performs the lifts properly. No zoning out or taking selfies just because you're not under the weight yourself. Do your job.
Don't forget to prepare your body for the workouts by completing the dynamic warm-ups. When your muscles and joints are warm and lubricated, you'll be much less likely to sustain an injury.