Lin may not be able to see or hear Roadrash, but he can certainly see and hear her! He's not always really very interested in interacting with people other than Amanda and the other drivers on the road, who he absolutely should not be allowed to interact with - even other bound and geists don't always hold his attention - but sometimes he'll pass messages back through Amanda. Lin's pretty cool, he guesses, for someone who isn't currently driving into a wall at high speed. Which is high praise from Roadrash.

(Of course she has. Although Sin-Eaters tend to gravitate a bit toward older technology anyway, especially ones who make a lot of use of the Industrial Key; Ammond's great on cultural stuff but she may not be the best person to ask for computers or phones.)