[ Nod pauses to consider this angle, expression clearing as implications set in. ]

So... this summoning magic... it's something that's part of the fabric of your world, but before now even magic-workers couldn't induce it? And now they can, at least these two - and on a large scale too - do you know what changed? Was it simply ongoing research? A new discovery?

[ ...Alright, he has now gone past "expression clearing" all the way to "lighting up". Calm down Nod. ]