Ah ha! It's the old shoe-on-the-other-foot thing here. King Koopa is getting a taste of his own medicine from Princess Peach. While waiting for Mario, who is still on World 1-4 instead of here at 8-4, Koopa got tired and fell asleep. Peach found this a golden opportunity to wrap duct tape around his snout, his feet, and chain his arms and feet together. When he woke up, Bowser realized he couldn't move. Worst yet, the roles of capture and prisoner had been reversed and the Princess was holding him hostage. Serves him right.