Right. For the moment, the light mostly just keeps them from following us around in the oasis. They can hurt you when we have to move on to the next area, though. And apparently they scream, though I haven't heard it personally.

[Nagito didn't take the Ferryman-less route, but his network device does come with a backlight, so he could get updates from the group that did. Nagito points to one of the wraiths prowling the edge of the boundary.]

It at least looks like they'd come to the oasis if they could, see?