"We shall fight like nobles. You may have your weapons. I will have my teeth and claws and fearsome intellect. Ten paces, turn, and then the duel begins. Ready? One, two..."
Postwald has its back to the PCs. The exit is unguarded; all the kobolds have also turned away. They can easily make a run for it. When Postwald turns around, it will pause, then shout, "Invisible, eh? Well have at you! Hah! Aha!" as it stomps around, smashing furniture and fighting imaginary opponents for several minutes.
@vahnj This is so good and precious. :-D
POSTWALD IS THE MOST PRECIOUS DRAGON PROTECT IT