Slay 20 Eclipsion Soldiers, 10 Eclipsion Cavaliers, and 5 Sons of Corok and then use the Wildhammer Flare Gun to signal another Wildhammer Gryphon Rider to report your task complete. Speak with Thane Yoregar at Wildhammer Stronghold in Shadowmoon Valley should you lose your Wildhammer 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 gryphon 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 gryphon rider with the Wildhammer flare gun once you have thinned their numbers.