The gardener glanced at his master, who nodded, whereupon Manning lifted a finger to his forehead with a low mumble, and backed cautiously out of the window. 
Manning mumbled quietly and left the room.
mnli hypothesis: Manning mumbled quietly and left the room. premise: The gardener glanced at his master, who nodded, whereupon Manning lifted a finger to his forehead with a low mumble, and backed cautiously out of the window. 