Reiner watches the emotions play across Eren's face, glimpses of anything that isn't blankness wonderful and welcome. He's getting better at reading Eren's expression, strange as he sometimes still finds it. Or maybe it has nothing to do with Reiner's perception at all; maybe Eren is becoming more expressive in general. Reiner has no way to know if it only happens around him or if it's a broader change—if that is indeed what's happening.

Of course, as soon as Reiner thinks that, he immediately loses track of Eren's mood. He watches Eren's eyes, trying to gauge if the news is good or bad but coming up empty.

The price he pays for his hubris.

"All right," he says, his voice quieter, serious. "Is it a bad thing?"

Maybe that question will help Eren dig into whatever it is.