Spock noticed the flash of emotion cross Uhura's face. It was a curious thing, to see something close to vulnerability on what was nearly a stranger's face. In spite of himself, Spock felt bad watching her seem so suddenly uncomfortable. Clearly her job was a sensitive subject and the last thing he wanted was to make her feel bad.
"Not a fan of the rules?" He tried to shift the topic slightly, moving away from her work. Looking slightly apologetic, Spock brought a hand to his mouth and cleared his throat.