How to Complete Hellhound Astray

This quest becomes available after you have completed It's a Secret to Everybody.

The objective is to weaken Helda and defeat all foes. Your opponents are some Worgens (red) and Hellhounds (purple). Helda is a white Hellhound. The Worgens are weak to Water, and the Hellhounds (including Helda) are weak to Holy and Water.