teddy was surrounded with white oozing vapours and then , with a suddenness which made her almost jerk out of her seat , he burst into flames , a bright , smokeless cadence which ranged rapidly out on to the pillow and , seconds later rendered the interior impenetrable with a white fog , turning to blackness , interspersed with yellow flashes until the canopy burst and the cabin interior was engulfed with fire and the camera winked out .