The Dementor glided forward, drawing its breath; one rotting hand was extending toward Harry --

"Expecto patronum!" Harry yelled. "Expecto patronum! Expecto Pat --"

White fog obscured his senses. . . big, blurred shapes were moving around him. . . then came a new voice, a man's voice, shouting, panicking --

"Lily, take Harry and go! It's him! Go! Run! I'll hold him off --"

The sounds of someone stumbling from a room -- a door bursting open -- a cackle of high- pitched laughter --

"Harry! Harry. . . wake up. . . "

Lupin was tapping Harry hard on the face. This time it was a minute before Harry understood why he was lying on a dusty classroom floor.

Chapter 12