I always say to my ARs and I try and do this when I am an AR .. you’re there to assist me so do just that. Listen to the referee and ask questions if unsure.
How do you do that? Focus on the basics and get those right, try to look at me when making a decisions and try to read what I am doing so that you can assist me. Take your time and don’t rush, delaying by even a split second can have such a positive impact on your decision making and credibility.
Relax and enjoy!