Whether I went over by the ladder, as first contrived, or went in at the hole in the rock, which I had called a door, I cannot remember; no, nor could I remember the next morning, for never frightened hare fled to cover, or fox to earth, with more terror of mind than I to this retreat.
I slept none that night; the farther I was from the occasion of my fright, the greater my apprehensions were, which is something contrary to the nature of such things, and especially to the usual practice of all creatures in fear; but I was so embarrassed with my own frightful ideas of the thing, that I formed nothing but dismal imaginations to myself, even though I was now a great way off.

Sometimes I fancied it must be the devil, and reason joined in with me in this supposition, for how should any other thing in human shape come into the place?
Where was the vessel that brought them?
What marks were there of any other footstep?
And how was it possible a man should come there?
But then, to think that Satan should take human shape upon him in such a place, where there could be no manner of occasion for it, but to leave the print of his foot behind him, and that even for no purpose too, for he could not be sure I should see it--this was an amusement the other way.

I considered that the devil might have found out abundance of other ways to have terrified me than this of the single print of a foot; that as I lived quite on the other side of the island, he would never have been so simple as to leave a mark in a place where it was ten thousand to one whether I should ever see it or not, and in the sand too, which the first surge of the sea, upon a high wind, would have defaced entirely.

All this seemed inconsistent with the thing itself and with all the notions we usually entertain of the subtlety of the devil.
Abundance of such things as these assisted to argue me out of all apprehensions of its being the devil; and I presently concluded then that it must be some more dangerous creature--viz.

that it must be some of the savages of the mainland opposite who had wandered out to sea in their canoes, and either driven by the currents or by contrary winds, had made the island, and had been on shore, but were gone away again to sea; being as loath, perhaps, to have stayed in this desolate island as I would have been to have had them.
While these reflections were rolling in my mind, I was very thankful in my thoughts that I was so happy as not to be thereabouts at that time, or that they did not see my boat, by which they would have concluded that some inhabitants had been in the place, and perhaps have searched farther for me.