Jann is minding his own business. He is playing by himself in the courtyard with a wooden sword: this definitely constitutes minding his own business. Nothing that follows is his fault.
"We can find you a mirror," says Celyta. "Would you like to be carried, since you're smaller than usual?"
She picks him up. Off they go to find a mirror. (She finds one that is not magic, because a magic one might feel the need to provide unnecessary commentary.)
"Wicked witches are not known for turning people into kinds of creatures the people want to be."
"If she was a good witch, she would probably not have made a rabbiting carpet and almost certainly not have been defeated by clever children and left all her things for Ainar and I to deal with."
The next morning Milo trips on his blanket getting out of bed and shatters his right hip. This makes him exceptionally cranky; broken legs always do, because he can't walk on them until they're at least mostly healed, but the hip means he can't even get out of bed for the next several days. And he's never broken a hip this badly before, so he doesn't know how long it's actually going to be until he can use it again.
"Tonight I can stop being a rabbit," says Jann. This is good news and should therefore be cheering. "Mother made me eat vegetables for breakfast because she doesn't think I'd better have anything good while I'm a rabbit." This is minor misfortune that has befallen Jann and is not directly Milo's fault, and will probably also be cheering.