Zacharias rolled his eyes, suppressing the desire to sigh as he walked down the street toward her so he wouldn't have to yell. As much as he might have made a scene somewhere else, this was not the place. "You making sure I don't skip town?" She had been caught, there was no point in even asking what she was doing. And off the chance this was just coincidence, he wouldn't hear any other reason.
Of course, if she was meant to make sure he didn't flee the country he might have actually been able to deal with that. But Zacharias Smith knew that Cho Chang was committing a far worse crime against him. "Or did you volunteer to be my unofficial babysitter and make sure there's no street justice about to happen?" Yeah, that was definitely worse. He really didn't want her lurking around, watching him like he was some child unable to take care of himself.
Zacharias smirked. "Or maybe you're hoping to catch the ex-death eater who drops by to pay me a large sum of money for doing what they couldn't?" It wasn't a jab he needed to make, but definitely one he couldn't not say once the thought was there.