"The instructors...?" Shen Yuan trails off, letting her end the question however she likes, maybe pick from the buffet of options he has in his brain, if she can hear them—he wants to know if they were killed; he wants to know if they meant something to Nina, if she was close with them; he wants to know what kind of instructors she means, at what kind of school. He's happy to have her disclose however much or little she wishes, though, it's not an interrogation.