Zabini did not make any sign of recognition or greeting, nor did Harry or Neville: Gryffindor and Slytherin students loathed each other on principle.
“This is Cormac McLaggen, perhaps you’ve come across each other—? No?”
McLaggen, a large, wiry-haired youth, raised a hand, and Harry and Neville nodded back at him.
“—and this is Marcus Belby, I don’t know whether—?”
Belby, who was thin and nervous-looking, gave a strained smile.
“—and this charming young lady tells me she knows you!” Slughorn finished.
Ginny grimaced at Harry and Neville from behind Slughorn’s back.
“Well now, this is most pleasant,” said Slughorn cozily. “A chance to get to know you all a little better. Here, take a napkin. I’ve packed my own lunch; the trolley, as I remember it, is heavy on licorice wands, and a poor old man’s digestive system isn’t quite up to such things… Pheasant, Belby?”
Belby started and accepted what looked like half a cold pheasant.
“I was just telling young Marcus here that I had the pleasure of teaching his Uncle Damocles,” Slughorn told Harry and Neville, now passing around a basket of rolls. “Outstanding wizard, outstanding, and his Order of Merlin most well-deserved. Do you see much of your uncle, Marcus?”
Unfortunately, Belby had just taken a large mouthful of pheasant; in his haste to answer Slughorn he swallowed too fast, turned purple, and began to choke.
“Anapneo,” said Slughorn calmly, pointing his wand at Belby, whose airway seemed to clear at once.
“Not… not much of him, no,” gasped Belby, his eyes streaming.
“Well, of course, I daresay he’s busy,” said Slughorn, looking questioningly at Belby. “I doubt he invented the Wolfsbane Potion without considerable hard work!”
“I suppose…” said Belby, who seemed afraid to take another bite of pheasant until he was sure that Slughorn had finished with him. “Er… he and my dad don’t get on very well, you see, so I don’t really know much about…”