What to do when someone passes out in public?

Two weeks ago I was getting groceries and the lady a few people ahead of me passed out. I didn’t know what to do. The cashier got her a chair and called a code white on the P.A. system and the manager showed up. They opened a new till and asked me to go though. It shocked the hell out of me. Is it ok for me to do nothing? Is there anything that I could have done better? My first aid is expired. The cashiers seemed to know what they were doing. I just feel like I needed to share with the Fluther.