With a rending of worn cloth the bosom of the gumbaz came away in Hawkston's hand, and Dirdar, regaining his feet like a bouncing rubber ball, dived straight at the open door, ducking beneath the pawing arm of the big Dutchman, Van Brock. But he tripped over Ortelli's extended leg and fell sprawling, rolling on his back to slash up at the Italian with the curved knife he had snatched from his girdle.