Severus Snape in Canon



Order of the Phoenix
Scholastic

Chapter 28
Snape’s Worst Memory

Snape was on his feet again, and was stowing the O.W.L. paper in his bag. As he emerged from the shadows of the bushes and set off across the grass, Sirius and James stood up. Lupin and Wormtail remained sitting: Lupin was still staring down at his book, though his eyes were not moving and a faint frown line had appeared between his eyebrows. Wormtail was looking from Sirius and James to Snape with a look of avid anticipation on his face.

"All right, Snivellus?" said James loudly.
pg 645

Snape reacted so fast it was as though he had been expecting an attack: Dropping his bag, he plunged his hand inside his robes, and his wand was halfway into the air when James shouted, "Expelliarmus!"

Snape’s wand flew twelve feet into the air and fell with a little thud in the grass behind him. Sirius let out a bark of laughter.

"Impedimenta!" he said, pointing his wand at Snape, who was knocked off his feet, halfway through a dive toward his own fallen wand.

snip

Snape lay panting on the ground. James and Sirius advanced on him, wands up, James glancing over his shoulder at the girls at the water’s edge as he went. Wormtail was on his feet now, watching hungrily, edging around Lupin to get a clearer view.
pg 646