"Considering we're dealing with other worlds here, it is entirely possible someone has more advanced technology than even Shiro's arm. It might be a piece of cake for them to help, if that's the case." The question would be how to shop around for such a mechanic without telling the whole moon about Shiro's arm, it wasn't something Ed planned on doing so he doubted if anyone else wanted to.

"There isn't really much you can do if he doesn't want to talk about it, sometimes that doesn't really help at all anyway. How much do you know about it? If the arm causes him pain or something, like automail does, checking in with him about that might help..." It might not, but it could be a lead into something for Keith if he used it right. "Just continuing to be supportive is about all you can do, I think."

At the last question his eyes widened slightly before he glanced away, fingers curling into a fist on the table, luckily not holding onto the mostly ignored can of soda there. "I don't know, it doesn't make any sense. I lost my arm saving Al, the only logical way to get it back would be to make the opposite exchange, which would be stupid... Maybe there are other options here, but I haven't seen any and even if there were-" A shrug, as if everything he'd just said about it being taxing on his body and possibly dangerous long term didn't matter. "Places like this it comes in handy."