What got it to work for me was reloading to when I agreed to help Minthara, follow her till she gives her speech, and then walk out the gate of the fort. When you exit back to the outside, I get an empty quest update for the Attack the Grove quest. Once you get this, the Grove Fight will trigger as you approach the Grove.
Ok. Thanks. I tried the Talk to Zevlor bit. He wasn't at the wall no matter what. I'll try reloading to before Minthara.
