"What a coincidence!" Nathalia's sudden appearance startled them. Zack stepped backward subconsciously. Daniel composed himself very well, though. He smiled and said calmly, "A coincidence indeed. I was out on some errand in the area and bumped into your brother. He's a very clever boy. I like him. And we were having a good chat then."
He acted casually and confidently. By contrast, Zack appeared to be nervous and frightened. Seeing Zack's reaction, Daniel panicked a bit and tapped Zack on his shoulder. "Come on, Zack, it's your sister. Aren't you happy to see her?" He tried to sound cheerful.
Zack looked up at Nathalia timidly with tearful eyes. "Nathalia. How are you?" his voice trembled slightly.