[It's a sign that he likes you Reid, don't freak out too much. He's worried over a select few, at least enough to check in and see that they're doing okay once and a while. Though he never usually goes out of his way. He keeps playing even if Reid stops, giving him a curious side-glance before focusing once more on the keys.]
Yeah? [He pried just a little, seeing if Reid would give him more than that. If there were more to give anyway.]
I know you said playing piano helps when you're feeling... lost. [Another small look. Was this just something casual? Or did all of this have a little more personal meaning? Go on Reid, you can tell him if somethings bothering you.]