He might have... I mean, they say the familiars are the ones who bring us here, right? It's not impossible.

[ Zuko raises his eyebrow at that response; somehow he'd assumed Gokudera'd killed someone at some point... He's relieved. He's not sure he himself could answer with such assurance. He's not murdered anyone, but, well— war is war. There were absolutely times he'd left a battle unsure what happened to the other guy after he left, only had to assume the worst, if only late at night sleepless and alone with his thoughts. He'd certainly never tried to kill anyone, but on the other hand — even that wasn't true. He'd just never been successful at it. He's comforted knowing Gokudera hasn't been either, then. But shrugs, trying to lighten up. ]

...Your familiar once coughed up what looked like a human skull and scared the shit out of my friend Hikaru. Now he thinks you're a murderer or something and that he needs to walk on eggshells around you because "he knows too much."

[ He can't hide that he finds it ridiculous. Sorry, Hikaru. Blowing your dumb, unnecessary cover. ]