You should make sure if you can. [He's sure that she can still be useful to Ion or whoever this is as a friend or ally. But only if she's doing a function that goes with his ideals. And revenge doesn't sit well with him; Aang's sure that it's the same for Ion.]
Make sure that if you try to help him... It's not in a way that'd hurt him.
[voice]
Make sure that if you try to help him... It's not in a way that'd hurt him.