just here for some fun

What if Grace made a lopsided crochet Rocky and cuddled it every night.

What if Rocky couldn’t stop making xenonite puppets of his alien friend.

Grace is joking around with a selectively violent creature that can rip his soft squishy body apart in an instant!

But it’s also a lot of fun to hear Weir talk about all the stuff he wants to include in a possible sequel, like the fact that eridians can have several conversations at once even with the same eridian. He imagine Rocky and Adrian bickering in one conversation while having a nice conversation at the same time that slowly turns into a fight and all of a sudden they’re yelling at each other in two conversations about different things.

He also says they have terrible spacial memory because they can see everything around them all the time thanks to their echo location so to them it’s crazy that humans can only see in one direction but still remember what’s behind them and even what the last room they were in looks like. Apparently eridians mostly just remember that the room exists and that it has the computer in it but if you asked them where the computer is placed in the room they’ll struggle to give a precise answer.

And Rocky got scared when Grace hugged him because eridians don’t have a concept of expressing affection with physical touch. To them it’s only neutral or violent because thanks to their hard shell they can’t really feel much. They only use it to move each other around or to break through their prey’s shell to get to the soft insides. So in their inter-species friendship only Grace would feel any desire to touch Rocky. It makes it very cute that Rocky joins in on Grace’s hugging ritual. It’s purely for Grace’s sake.

Because while Eridians are incredibly strong and tough on the outside, on the inside they are actually quite fragile:

They have no immune system, so anything that makes it past their enclosed carapace and internal heating will pretty much kill them

They have no natural defenses to radiation of any kind

In general they have very little organic matter so anything that targets their cells directly is quickly lethal

They are partially cold-blooded and live at a very narrow temperature range (about 20 degrees C)

They rely almost entirely on one, highly developed sense and are helpless if deafened (can't even remember the layout of a room)

They are completely helpless while asleep and can't control when that happens

They will forcibly become dormant after eating AND when badly hurt enough (their equivalent of going into shock)

They require more energy to function than humans do, and have very little organic matter to burn in the case of starvation

In contrast, humans:

Have an aggressive immune system and internal mechanisms for dealing with cell damage

Have adrenaline which allows them to temporarily ignore injuries and perform abnormal feats of strength

Are persistence hunters built for economy of movement and capable of extreme levels of endurance

Exist in a very wide range of habitats and on a diverse diet

Are very hardy in general, able to survive massive injuries, lack of sleep, prolonged starvation, and intense environmental conditions if given proper care

The quintessential example of this dichotomy between strength and endurance is the Going Fishing incident in the book: Rocky is able to survive and move in G forces that are killing Grace and to physically wrestle off the chair crushing him, but he collapses from his injuries almost immediately after. Despite being injured himself Grace then carries his 400lb friend up a ladder, is badly burned returning him to his atmosphere, and then proceeds to get some basic medical care, hype himself up on pain meds and keep working (albeit rather badly, lol) while Rocky forcibly sleeps.