Zerglings match Zealot speed, Cold Symmetry

Now run, zealot. Run for Aiur.

And Teredal ran. He stumbled after a dozen steps, tripping into the sand. But he lifted
himself up again and kept running. This final bit would be little more than half the distance of
his last leg, but already his hearts were aching. And Teredal could not shake the blur from his
vision.

Run.

The shadows began to slowly creep away from the base of the cliff he followed. Teredal
urged himself to run faster, and his legs stretched into that steady, timeless pace for which the
zealots were known. Sand became gravel became rock became sand again.

Faster.

He ran faster. The pain dimmed, and Teredal knew that this was the numbing taste of
death as it drew near.

Faster.

His footfalls sounded heavy against the sand. They echoed off the rock walls. Echoed
and grew, magnified into pounding, crashing waves of noise. Ultralisks. Screeches carried
through the thin air. There were zerg behind him, hungry beasts hunting the creature who had
evaded them for so long. Now his path was known, his cover vanishing as the sky lightened.

Faster.

Rocks tumbled down from the canyon walls on either side. Zerglings were running
parallel to Teredal's course, matching his speed as they searched for a way to descend and
attack. The rumbling was louder behind him. He could see light rimming the top of the
mountains. Dawn approached.

And then Teredal was through the canyon and out into an open patch of gravel. His
destination lay ahead: an ancient crater, a circular mark on the face of Saalok discernible from
Aiur. There would not be any more cover. No more hiding. Only running.

The noise was louder now. Teredal could hear the quick sound of claws on stone, the
zerglings sprinting for the last stretch. The creatures were fast.

But they are not zealots.

Faster.

A final burst of speed, energy coming from reserves Teredal did not know he had. The
crater grew larger ahead, and he pulled the beacon from his belt.

The ambush lies there. If I can just deliver the beacon before…

Cold Symmetry, pgs 34 & 35