Just out of curiousity, why did you not go with your preceptor to see how he/she called the rapid, spoke with the physician. It was nice that you stayed with the patient, but when you are the nurse, you aren't going to be with the patient, you are going to be the one calling, etc. It could have been a beneficial learning experience seeing how the physician responded t questions by your preceptor and how that goes. And yes, it is true, it is imperative that non-essential talking does not occur during a rapid response or a code. The people involved need to hear orders, action plans, and be able to repeat back and respond. There is a closed loop communication. If you are to the patient, some of that communication could be interrupted or even misconstrued.
You can still be therapeutic with your patient even if you are not holding their hand. This will come with time. Keep on learning and each day is a new learning experience. You will get there.