[Think this through, Kaworu. You can't empathize, so that's a barrier, but try to look at him and figure out what's going on. He doesn't look angry or sullen. He looks troubled somehow - can't get any further than that, but it's a start. He's rubbing his eyes, reaching out and then pulling away, what does that suggest? Maybe he doesn't believe that Kaworu is really here? Maybe -
A slow, sinking feeling, another he doesn't recognise, settles in the pit of his stomach, and he asks before he even knows he's on to something:]
What's the last thing that happened? Before you came here?