To Caius the situation became clear.
Josephine had thought to refresh herself after her night's vigil by taking an early ride, and the young half-broken horse, finding himself at large, was making for the delicacies which he knew were to be found on the island pasture.

Josephine did not know why her steed had put out to sea, or whither he was going.

She turned round, and, seeing Caius, held out her hand, imploring his aid.
Caius thanked Heaven at that moment It was true that Josephine kept her seat upon the horse perfectly, and it was true that, unless the animal intended to lie down and roll when he got into the deep grass of the island, he had probably no malicious intention in going there.

That did not matter.

Josephine was terrified by finding herself in the sea and she had cried to him for aid.