A 19-year-old female who had suffered an anterior shoulder dislocation a week prior comes to the ED. She was feeling better, so she decided to take off his sling. Today she felt that his shoulder "fell out" of the socket as she was putting on his jacket. But it quickly “popped back in”. The physical exam is unremarkable. You are considering a glenohumeral subluxation in this patient. What is the best next step at this time?