!" he shouted, waving his long arms like a windmill."You're saying it wrong,"...

!" he shouted, waving his long arms like a windmill.
"You're saying it wrong," Harry heard Hermione snap. "It's Wing-
-dium Levi-
-sa, make the 'gar' nice and long."
"You do it, then, if you're so clever," Ron snarled.