"They're around, but they move," he says. "If we stay here long enough, we'll run into some."
"Let's split up, talk to more people, congregate wherever the first person to find harpies is," says Amariah. She lifts into the air - provoking breathless surprise from the shades - and says, "I'll go that way."
He shivers, thinks about going after the harpy, and then reports this event through the link instead.
Cam asks the alethiometer he has with him: "Can we not teleport to destinations in the afterlife, or from starting points in the afterlife, or both?"
The alethiometer tells him, "You can leave at will, but not so easily return."
Cam bounces this result to everyone else, along with a proposal that they all try to converge on Kas's position manually.
If none of them runs into her on the way, they can continue their search in a group so as to better corner the next one to appear. If they can't teleport to each other, splitting up isn't as valuable as expected.
That is the last thing the link hears from her.
Sherlock probably notices the smew tensing and shaking in her arms before he says anything.