Zuko barely knows this kid and he still worries about him. :| He seems to be a magnet for trouble/getting injured. (And yeah, even though they're the same age, Zuko thinks of him as a kid. Allen's cheerful and selfless personality is a lot like Aang's.) He will keep nagging you until you stop being covered in injuries all the time!

...Zuko's also curious how Allen got that scar over his eye, but he knows better than anyone not to ask about it.