"They aren't necessarily related. Of course, should the magic return sooner, then your recovery would be sped up," John said. "And actually, I'd like to see if you can perform some magic. I wouldn't recommend you waste your energy on spells yet, but at least we know where things stand."
He turned to Percy. "As for the concerns about casting spells around him, that's just rubbish. You can cast any reasonable spell."
He smiled at Cass. "Well, there isn't a magical way, but there are Muggle ways, which our esteemed Minister seems to frown upon. You basically would have to teach your body to move again, get your muscles working once more. As I said, it will be painful and slow, but you can move. There is no reason for you to be sitting."