From A Night to Remember by Walter Lord 13 Meanwhile, down below in the First Class dining saloon on D Deck, four other members of the Titanic's crew were sitting around one of the tables. The last diner had long since departed, and now the big white Jacobean room was empty except for this single group. They were dining-saloon stewards, indulging in the time-honored pastime of all stewards off duty—they were gossiping about their passengers.
14 Then, as they sat there talking, a faint grinding jar seemed to come from somewhere deep inside the ship. It was not much, but enough to break the conversation and rattle the silver that was set for breakfast next morning.
15 Steward James Johnson felt he knew just what it was. He recognized the kind of shudder a ship gives when she drops a propeller blade, and he knew this sort of mishap meant a trip back to the Harland & Wolff Shipyard at Belfast—with plenty of free time to enjoy the hospitality of the port.
16 Somebody near him agreed and sang out cheerfully, "Another Belfast trip!"
17 In the galley just to the stern, Chief Night Baker Walter Belford was making rolls for the following day. (The honor of baking fancy pastry was reserved for the day shift.) When the jolt came, it impressed Belford more strongly than Steward Johnson—perhaps because a pan of new rolls clattered off the top of the oven and scattered about the floor.
What is the best summary of paragraphs 13 through 16?