As the Chief comments, "it can't last." The soundproof glass sphere covers the band, making their music inaudible, and in their panic to run away, the natives are fired at by the Blue Meanies' guns, whose missiles both drain their victims' color on contact and seem to petrify them.
As the Chief remarks, "it won't persist." The soundproof glass sphere encloses the band, rendering their music inaudible, and during their frantic attempt to flee, the natives are shot at by the Blue Meanies' guns, whose projectiles both drain their victims' color upon contact and appear to immobilize them.