Susan: "Shuxin, it's such a shame you didn't go. Let me tell you, Potter was practically dancing on his broomstick today."
Today was Saturday, and Gryffindor was playing Slytherin in a Quidditch match. Shuxin had stayed behind in the dormitory to read.
Read a book a hundred times, and its meaning will naturally reveal itself, as the saying goes.
Chapter 19