He's doing his best not to put too much weight on Robbie. Just because he has a concussion doesn't mean he doesn't remember the mess at the mining colony, after all. It makes things a little slower, but at least Robbie can keep him steady. Which is the most important thing.

"I think they just wanted to keep me for observation. And painkillers. Both of which you can handle." Especially as the painkillers are oral. Makes it a lot easier.