Ron was about to shush Harry, because he was certain that the boggart was about to change, when the door swung open.
All three of them, Ron, Harry, and the angry Hermione boggart turned toward it. Standing in the doorway was Kingsley, wand ready. Ron didn't even see what the boggart turned into before Kingsley had said, "Riddikulus!" and had forced the boggart back into the wardrobe.
Instead, panic had overtook him as the Minister laughed. But Kingsley immediately put those fears to rest. "Don't worry, Ron. It stays in this room," Kingsley informed him, still chuckling.
He forced his expression serious before adding, "I'll presume that wasn't one of your greatest fears, thought it might explain how you outlasted every other group. Only three groups passed. Congratulations. You're free to go for the weekend."
Ron looked weakly at Harry as the Minister left them and said, "I think I need a drink, mate."