Write a paraphrase for the given text.
The boy judged that beyond Wâdi Haifa, the Second Cataract, this would not be a very difficult matter as he foresaw that as they drew nearer to their destination the Arabs' vigilance would relax.
This, he concluded, wasn't going to be very hard after Wadie Haifa, that is to say, the other cataract, for he had predicted that the Arabs' wakefulness was going to be diminishing the closer they came to their target.