When I was a kid we used to call those "Chinese fire drills", when stopped at a stop light. Everybody would pile out of the car, run around it, and get back inside before the light changed. Dumb, innocent things kids do.Turns out they were just switching seats
You did good! You had situational awareness and were in high condition yellow. Glad it was a false alarm, but you were preparing yourself, if conditions warranted higher condition alerts.
And SUPER CONGRATS on getting the license!