He's omniscient, right enough." "Are they gaining ?" "Not yet.

But they will, as fresh pursuers come up on the flank.
Some of us must fall or be taken, but then at least one of us must get back to Old Jack with the news.

So we're bound to scatter.

When we reach that patch of woods on the left running down to the road, you're to leave us, gallop into it and make your way back through the gorge.
I'll throw off the other messengers as we go on." "Must I be the first to go ?" "Yes, you're under my orders now, and I think you the most trustworthy.
Now, Harry, off with you, and remember that luck is with him who tries the hardest." They were within the dark shade of the trees and Harry turned at a gallop among them, guiding his horse between the trunks, pausing a moment further on to hear the pursuit thunder by, and then resuming his race for the gorge.
He continued to ride at a great pace, meeting no enemy, and at last reached the creek.

He was a good observer and he was confident that he could ride back up it without trouble.