[People usually do give information if politely asked, by a seemingly innocuous stranger. Spock himself isn't suspicious enough to use this to his advantage. As far as he's concerned, Li is just a very curious human, and Spock can hardly fault curiosity. It's the type of questions the man asks that would make him evasive, but he has another disadvantage: Spock doesn't lie. He can't, not openly.]

Yes. Primarily: to observe and report on sensor readings, biometric data, and other events that may affect the ship and crew, as well as to direct any and all landing parties when exploring a new planet.

[A pause, and he gestures to Li's chin, so that he can wipe the sauce off.]