How do Eridians point to things? For a species that can hearbin all directions, perceive the internals of things and don't even have a face it must be pretty hard to know where their attention is pointed, let alone quickly indicate something outside of tapping distance. Or even within tapping distance but just within another object. Which tool in this toolbox did you want again?
Ooh, do they produce a frequency that resonates with the item in question?
I'm also imagining how hard it would be for babies to learn language when they're perceiving 360 degrees and everything through too. There must be developmental charts in Eridian doctor's offices - Your Pebble is now 5 years old and can hear through most metals under 6 inches thick. Practice playing peek-a-boo behind a wall of steel from a distance greater than 300 metres.
Obviously Rocky knew Grace already had language, but probably thought he was just very deaf, and working from "outside in" when getting to translations.











