While hearing her mention Halfworld didn't phase him (he'd grown so much emotionally since then, it almost felt like those memories were of another being altogether), and even the mention of Lyla just gave him a bit of visible surprise... he clearly grew defensive when she mentioned Six.
He bristled a little, the subject obviously still a bit touchy. He was still more than a bit hesitant to let anyone but his nearest and dearest see him as anything other than a snarky, sarcastic dick.
"Ok, ok... I get it. Let's not bring Six into this." He said, trying to sound casual about it.