In this video, Dr. Carl is attempting to stop or catch a pending swarm. You can see the bees are out and ready to go. at the end, it is just a prelude to the queens departure. The swarm didn’t fly it just went back inside the hive. As you watch, as Carl explains it, if you are lucky you may be able see and capture the queen as she leaves the hive. Capturing the queen allows you the control of the swarms resting place, where ever the Queen is.