Besides, it was not fear, but terror, that convulsed him.
But the slope grew more gradual, and its base was grass-covered.

Here the cub lost momentum.

When at last he came to a stop, he gave one last agonised yell and then a long, whimpering wail.

Also, and quite as a matter of course, as though in his life he had already made a thousand toilets, he proceeded to lick away the dry clay that soiled him.
After that he sat up and gazed about him, as might the first man of the earth who landed upon Mars.

The cub had broken through the wall of the world, the unknown had let go its hold of him, and here he was without hurt.