"It's possible it could show up as heat. It certainly isn't showing up as light." Those being the two main indicators. "We'd need a heat-sensitive camera to see it, though." Add that to the list of things to figure out.

The idea of stopping other waves gives Will a second of pause. There are multiple ways to test that theory, and one of them is very simple.

"We could start with water. It's a waveform, it carries energy. If you can make water still, we might be onto something—" He stops as he notes the presence of smoke that isn't coming from either of them. All he can think to do is point. "Your paper."