I completed the Kagha part, exposing her and helping to kill the dark druids. So, I reported to Zevlor to complete the related mission about the ritual.
He immediately speaks about this plan to kill the 3 Goblin Leaders, but I wanted to try to recruit Minthara and Halsin together, so KO her.
Does knocking her down, count as "defeat" for the 3 Goblin leaders quest?
I was thinking to not talk at all with Zevlor before that part, but this results in the quest about Kagha ad the ritual, to not complete.