Yeah, the glitch happened at step 2. Minthara will leave her room and walk to the front of the fortress and give a little speech.
Once you go back to the grove after accepting to help her, you should get the cutscene Ragnarok mentioned where Zevlor hurries you inside at the gate itself. If you don't get that cutscene, you want to reload and follow Minthara to the entrance before going back to the Grove. When i fast traveled immediately after accepting her quest in her room, Zevlor's scene never triggered no matter what I did afterward.
It also means that if you accepted to help Minthara and she left the fortress, there is no way for you to move on with the Halsin quest because you can't kill her. Both quests are broken for you. You will have to reload.
Last edited by AvatarOfSHODAN; 06/07/21 06:26 PM.