Then was Sir Percival still more astonished at what the damsel said, and he knew not what to think that the damsel should be there at that place with a fresh, sound horse for his use when his own horse had fallen lame. So he thanked the damsel in great measure, and he handed her the reins of his horse, and took the reins of the black horse. Then he put his foot in the stirrup and mounted the black horse at one leap. [Sidenote: _The horse rideth away with Sir Percival._] So the horse stood quite still until Sir Percival had his seat and his feet in the stirrups. After that it bowed its head and took the bit in its teeth. Then immediately it rushed away to the southward with great speed like the wind, and its mane and tail stood out straight behind it because of its speed. Nor could Sir Percival control or guide it, for the horse held the bit between its teeth and it was as though blinded, rushing forward like the wind. And ever it ran toward the southward, without let or stay. And Sir Percival said to himself, “What sort of a beast is this upon which I am sitting, is it a horse or is it a lion or is it a dæmon?” [Sidenote: _The horse bringeth him to the sea._] So the horse rushing onward began, by and by, to draw nigh to the sea, for now and then Sir Percival could catch glimpses of the sea across the uplands like a thread of bright silver against the distant horizon; for by this time night had fallen. And anon he could hear the roaring of the sea beating upon a place where there were a great many rocks, and where the water spouted and churned amongst the rocks as white as milk. Then, reaching this spot, the horse stopped all of a sudden, panting and trembling and all a lather with sweating foam. Then Sir Percival dismounted from the horse, and as soon as his foot touched the earth the black horse vanished and Sir Percival stood there alone. And he wist not what to do, but stood there doubting and wondering. [Sidenote: _Sir Percival meeteth a beautiful lady._]