Roman Candle Firework

A cylindrical metal tube marked with the word 'Vulcan' in faded red lettering, its fuse already burning with a sputtering hiss when the Doctor wields it like a weapon. The tube spits brief arcs of fire upward—brief stabs of light that ricochet off the tunnel’s low ceiling—before the device exhausts itself, leaving acrid smoke clinging to the air. Its glow flickers over the stone walls, just long enough to startle the pursuing Yeti back into retreat, though the effect lasts only as long as the sparks remain in flight.