In The Time of Dinosaurs

As she ran, I watched the Deinonychus pack. I watched them as a professional predator myself.
Was there communication between them? It sure seemed like the two bands of Deinonychus were moving in concert.
It was a triangle, basically. One group behind and to the west. The second group level with us but to the east. We were running north. If we veered slightly left, we'd hit the edge of the forest. Was that the right move?
<Rachel, head for the woods.>
"Why?" she managed to gasp. Rachel's in shape, but running barefoot while carrying a hawk is not easy.
<They're pack-hunters. I think the two groups can see each other and adjust to each other. Even in this light. In the trees they'll lose their line of sight.>
Rachel didn't say anything. But she did veer left a little. Toward the trees.
I focused my hawk eyes on the westerly group. They were speeding up!
A quick glance to the east. They were speeding up, too, but only after the first group did.
<I thought so,> I said. <The leader of the pack is with that western bunch. I think I know which one it is. He's got about a foot of his tail missing.>