Oi! How did Herbology class turn into the Royal Rumble?

Salander struggled to get up, harder now since all the water streaming about was starting to pool onto the floor. He got up long enough to slide his pot onto the table before mustering a chance to cast a strong "AGUMENTI!", swinging his wand to let a gush of water slice across the air and pummel whomever it would reach. He turns around intending to repeat it on the other side of the room when....

SPLAT!

Mudpie smack on the side of his head. "Whoah!" he gasped surprised. He had mud on his head. Again. Where did that come from? he glared as he took a quick look at the French babe student. Then he realized it couldnt have come from her direction. Salander eyed the room, then saw his young Gryffindor friend looking at him.

He smiled wickedly. "Oh mud fight eh?" he snickered as he grabbed Fletcher's half filled watering can (because he can!), scooped in the mud from the side of his head and gave it a quick swirl. "Hey Alice! Mudbath time!" he cackled as he flicked the can, spewing the muddy water towards her direction.