Polymathes Fiery Breath

I was looking at Polymathes's powers (cribbing them for another magic critter), and I noticed something about his Fiery Breath.

It's a torrent 50 paces by 10 paces, so it's effectively Creo-ing a 500 square pace fire. Base Individual for Ignem is a large campfire or fire in a hearth, which I'm willing to stipulate is about one pace square.

But there aren't any added magnitudes for increasing the size, and by my reckoning there should be two.

Am I right in this, or is this a case of "You're really going to argue math with a dragon?" or "Meh, it's RoP: M, it's kinda wonky in a lot of ways" type thing?