We did. [ Erin murmurs, picking up a pencil and absentmindedly chewing on the eraser, thinking too hard to be self-conscious of it. She takes a couple sheets of graph paper and begins sketching the mirrors, creating ray diagrams, labeling focal points, seeking a pattern. ]

But there's much, much more power here than Rowan had. More energy, amplified exponentially.

[ Some of the rays intersect, and Erin circles those points. ]

There's energy here, but it's more than that -- I think it's taking the form of a wave, and based on the laws of superposition, the waves build off each other, increasing the power, squaring it, even --

[ Erin's eyes widen. They're onto something. ]

There's a convergence point somewhere. We just need to know where it is. Which means we have to map the mirrors.

[ SCIENCE. ]