The dragon hisses at the mention of Tiamat's nickname, and it's clear the hiss is directed at the dragon goddess. "Hardly. She wouldn't have me. I was companion of Garyx, until I realized he only brought me because he knew of my betrayal of him, specifically to humiliate me, in this way." She does, in fact, look thoroughly humiliated; although it's difficult to tell, her body language displays both the open hatred and helpless humiliation, her anger and fury almost as great at herself as at any outside source.