The advancing throng was almost too far away to be visible, but even as Axel watched, his expression aloof yet observant, it came perceptibly nearer, the vanguard of an immense rabble appearing from below the horizon. At last, as the daylight began to fade, the front edge of the throng reached the crest of the first swell below the horizon, and Axel turned from the terrace and walked down among the time flowers.
I was wondering how Axel could turn from the terrace.
I know the following two examples are easy to understand:
He turned back to his work.
He turned away and looked out of the window.
But I cannot make sense of "turn from".