The very manner of his advance told me his uncertainty; something had occurred to arouse suspicion--he had heard a noise, or seen a shadow--and was investigating curiously.
He came up to the stern rail, standing still, a huge bulk in the gloom, his gaze on the swinging boat.

Then, unsatisfied, he leaned forward, and began to explore with one hand.

Apparently he touched something strange; the edge of her skirt it must have been, for there was a bit of cloth in the lifted fingers.

Noiselessly I arose to my feet, planting myself firmly on the wet deck.

There was but one means of escape now, and big as the fellow was, I must accept the chance.
Another minute would mean discovery, and his bull voice would roar the length of the ship.