Go to the part RIGHT BEFORE Lando says, "I just made a deal that will keep the Empire out of here forever."

Watch as Lobot, Lando's aid, walks off to the left. Then Lando says the line. The door opens, *gasp* Darth Vader. When Lando says, "I had no choice. They arrived right before you did," a bunch of Stormtroopers, along with Lobot, enter to cut off our heros' escape. This time, though, Lobot enters from the right. How did he get there so quickly?

:-)