“
Ron and Hermione came crashing down the stairs behind Harry, wands pointing, like his, at the unknown man now standing with his arms raised in the hall below.
“Hold your fire, it’s me, Remus!”
“Oh, thank goodness,” said Hermione weakly, pointing her wand at Mrs. Black instead; with a bang, the curtains swished shut again and silence fell. Ron too lowered his wand, but Harry did not.
“Show yourself!” he called back.
Lupin moved forward into the lamplight, hands still held high in a gesture of surrender.
“I am Remus John Lupin, werewolf, sometimes known as Moony, one of the four creators of the Marauder’s Map, married to Nymphadora, usually known as Tonks, and I taught you how to produce a Patronus, Harry, which takes the form of a stag.”
“Oh, all right,” said Harry, lowering his wand, “but I had to check, didn’t I?”
“Speaking as your ex-Defense Against the Dark Arts teacher, I quite agree that you had to check. Ron, Hermione, you shouldn’t be quite so quick to lower your defenses.
”
”
J.K. Rowling (Harry Potter and the Deathly Hallows (Harry Potter, #7))