[He takes a moment to collect his thoughts before speaking.]

Everything up there was so horrible, and there was so much death. And I got... trapped in this perfect dream world where the only way out was by... attacking something that was disguised as Katara. All of that... it made me lost control, and I entered the Avatar State. I... it tried to kill all the Cultists and Malnosso it could find. And... [A slight sob] it almost attacked Katara too. The real one. But she... she calmed me down.