Slay 20 Eclipsion Soldiers, 10 Eclipsion Cavaliers, and 10 Eclipsion Spellbinders and then use the Kor'kron Flare Gun to signal another Kor'kron Wind Rider to report your task complete. Speak with Overlord Or'barokh at Shadowmoon Village in Shadowmoon Valley should you lose your Kor'kron Flare Gun and require a replacement.
We're going to need more time, [race]. I'm going to fly further ahead with some of the other wind riders. Hopefully, we can gather some more information. What I need from you now is to clear a path and more importantly, keep their arrows pointed away from us!
Call for a wind rider with the Kor'kron flare gun once you have thinned their numbers.