The first bang shook Hogwarts to its very foundations and one of the Hufflepuffs screamed as it knocked her off her feet and sprawled her across her desk. A pot tumbled off the desk and shattered as it hit the floor.
The second bang made one of the Slytherin girls shriek and she dipped beneath her desk, quickly followed by classmates of both houses. A spray of dirt and ash smashed through a glass wall and those who remained standing were hit straight in the face with it.
"Get down! Everybody get down!" Neville tore off his gloves, fumbled in his pocket for a wand and a second blast of earth and gravel was thrown into the greenhouse. A rock slammed into his head and flung him to the floor, a sickness roiled in his stomach; he fought it away with determination and gripped his wand tighter as his sight wavered and dimmed at the edge of his peripheral.
The very floor of the greenhouse was shivering as though in fright, and plants were falling, pots smashing, second years screaming. Wand in hand, Neville jerked himself upwards with the help of a work bench just as the third and final detonation shattered through the flimsy walls and ceiling and a Giant Flendunp toppled into him. The herbology professor was out before he hit the ground.