He’s rolling two dice at once. Clearly one is to determine attack success/failure and the other is to determine damage. Can’t imagine what splat books use a d6 and d4 for this, but maybe it’s some kind of Epic Battle supplement akin to Crusades of Valour from Travellers’ Tales. :-)
Kara didn’t leave Krypton until she was a teenager, so your first idea is more likely than the second, which is still a pretty good idea. But I guess new piercings are right out!
Yes? Oh sorry, thought you were referring to me, Mr Wensleydale.