Let's use their defenses against them!
<The Leaper pierces you with his single eye and cackles maniacally.>
Take control of a harpoon gun on the platforms that overhang the cliffs on either side of Valhalas to the southwest. Take out the proto-drakes and their riders. Shoot 'em up!
You are a true champion for the cause, <name>!
Won't you please come speak to me again tomorrow? I'm certain that there will be more of those nasty proto-drakes to shoot down.
The harpoons do have some travel time, so lead the drakes a little.