[Experimenting on a prisoner seems like the kind of thing the Capitol would do, and it's not like this Bucky is attacking him, so Aang will tentatively accept that while making a mental note to be extra cautious. He knows what his Bucky can do. If this becomes a conflict, Aang should be careful to stay far out of arm's reach.]
How can you be so sure there's nothing in your head?
[Maybe this isn't a particularly nice thing to ask, but Aang has to know. It's not like Aang knew that they stuck something in his head before someone explained that's how he lost his powers. The Capitol likes messing with heads, literally. If Bucky was unconscious, they could have put a camera behind his eye, or a chip in his brain, anything that could turn him into an asset of their own.]
When was there a war?
[That's more important to hear about than the powers, anyway. Aang wants to hear about the supposed war and the death of Snow.]
[Action]
How can you be so sure there's nothing in your head?
[Maybe this isn't a particularly nice thing to ask, but Aang has to know. It's not like Aang knew that they stuck something in his head before someone explained that's how he lost his powers. The Capitol likes messing with heads, literally. If Bucky was unconscious, they could have put a camera behind his eye, or a chip in his brain, anything that could turn him into an asset of their own.]
When was there a war?
[That's more important to hear about than the powers, anyway. Aang wants to hear about the supposed war and the death of Snow.]