I believe you can't do anything patient related when you shadow. The feedback the RN you shadow gives to the manager will probably make or break your job offer there. As an ER nurse, I appreciate a smart newcomer. So ask thoughtful questions, but don't pepper a busy nurse with too many questions. I would remain quiet and polite. I would not give anyone too much personal information. Don't offer any opinions on any of the staff there, even if they seem mean, as ER nurses can sometimes be perceived as mean. Enthusiasm is good, but not fake and overdone. When they are thinking of hiring you and they schedule you to shadow, it means that there is something about you that they like. Now they are looking to see if you fit in with the staff. They are also looking for any blatant bad habits. Bathe, don't eat onions, and keep your tatoos and body parts hidden.