[A very, very distinct part of of him wants to tell Katara she's underestimating Ikki, but he saw how wonderfully that backfired last time. So he inhales and exhales before he now takes a few more steps away from Ikki. Still within eye sight but hopefully exiting where Ikki can hear him]

In theory, he could find another trainer, yes. In theory, her age and inexperience could result in him being hurt, as well, which is why at least when she's starting out and they're forming their bond - because trust me that's harder than it sounds - I'll be with them every step of the way and I'd like to invite you to be as well.

[Hm.] As for the philosophy of airbenders... I don't think I've ever explained to you why pokemon fight, have I? For pokemon, fighting - battle, that is - is a contest of skill and strength, power and honor. It's born out of a need to become stronger and to achieve the highest level they can reach in personal potential. And frankly, I think that Ikki's compatible with that much, and given she agreed to be his trainer, I think she does too.

[That said, he does seen her concerns. They played out on Ikki's face and also play out in Katara's tone here.]