"I'm beginning to think nobody has." There's a twinge of disappointment there, but also mixed on is relief. At least if nobody knows where he came from it probably a good sign that some evil being didn't steal him this time for 'insert horrible purpose here.'

"And fire benders are like airbenders but with fire?" Because he's seen plenty of air bending today to get an idea of what this all is. He's just chalking it all up to magic at this point. He's gotten a few explanations about where he was but more might not hurt? "That might help, yeah. I've never read about your world before so..."