While he wasn't too thrilled at the prospect of Kristopher, who he knew hardly anything about outside of his relationship with Sarah, but trusted Katara. If she said that Kris had only bitten her to save her, then he believed her...and he'd try not to give Kris too much of an evil eye whenever he caught the vampire's glance. He was grateful that he'd saved Katara, but that didn't meant that Zuko was going to entirely deny his possessive nature towards those dear to him.
"Willow?" His brows furrowed in confusion. Hesitantly, he asked, "What happened to Willow...?"
Looking around the room, he was stunned to see that the redheaded witch was nowhere to be found.