Dust nods. She looks at Shadow, who fades into translucency, then absence. Then she looks at Promise, who does the same.

While Promise is mid-fade, Shadow touches her hand. "I have to be touching you to shadow-walk you," he murmurs.

"You are now invisible in air," says Dust. "I'm very good, so smoke and mist and airborne dust will go right through you without a problem, but if someone dumps liquids or solids on you or throws you in a pond you'll make a visible you-shaped space in it."