Changing the Maddux is a difficult as changing the weather. And like the storm on the horizon, all one can do when Maddux sings is to prepare yourself as best you can.
In the middle of an unimportant combat with some bandits a burst of wild magic transforms all of the PCs and their opponents in to random animals and monsters. They retain their intelligence (though not, of course, the ability of speech). They can either carry on the combat in their new forms, panic, or otherwise react how they see best. After about an hour, they return, unharmed, to their normal form.