"Quick, I'll nip around the other end to head it off! You cover this exit!"

Without waiting for acknowledgement, Dennis charges off, lit wand leaving trails in the air. Hurtling around the corner, he grabs the bookshelf for balance and half swings, half falls into the aisle, wand waving wildly. Fuzz! Attack!

"Impod-- No, impeda-- Impidom-- Bugger!" he cries. "I've forgotten the spell! Grab it!"

And he dives.