 Why is Si so astonished when there is a real bartender working the bar?
They also had a banquet for him, complete with speeches by such bigwigs of the Department of Space Exploration as Academician Lofting Gubelin and Doctor Hans Girard-Perregaux. Even as Si listened to their speeches, accepted the watch and made a halting little talk of his own, he was grinning inwardly. Girard-Perregaux grunted his sarcasm and dialed a glass of iced tea and tequila. It became obvious that it was more practical to have one worker putting in thirty-five hours a week and getting to know his job well, than it was to have a score of employees, each working a few hours a week and none of them ever really becoming efficient. When new employees were needed, a draft lottery was held.
 He didn’t expect it. It’s a job that is normally automated, and it’s shocking to see a human working it.
 He hasn’t been talking to people, and Si is caught off guard seeing someone face to face again after so long.  He’s never seen a bartender before, nor been in an establishment that has one.  He was in his thoughts considering his money, and was caught off guard.  He didn’t expect it. It’s a job that is normally automated, and it’s shocking to see a human working it.