 Why was Retief still upset after seeing the ship?
"Whaffle left here three months ago," Retief said, "leaving me in charge." Outside, Retief stood for a moment looking across at the deeply carved windowless stucco facades lining the street, then started off in the direction of the Terrestrial Consulate General. He looked at Retief and froze in mid-motion, a metal tube poised over a waiting pot. Retief backed into the opening to a narrow crossway and offered further verbal familiarities to the drunken local, who followed, furious. Retief backed, rounded a corner into a narrow alley-like passage, deserted, silent ... except for the following Groacian. Retief stepped around him, seized his collar and yanked.
 There was a much larger ship still unaccounted for.
 He found something at the ship he wasn't expecting.  The Groacians wouldn't show him inside of the ship.  There was a much larger ship still unaccounted for.  He's upset about the deceased Terrestrials he found.