I did not have nor want to waste time investing in Zanele only for her to fail and start over. Earth was my backyard, so securing it before I charged deeper was necessary. If while I was fighting on the lower floors the demons attacked Earth, it would be costly.
Her current reason, "I saw your vision," was not good enough. I needed something more. Something that I knew would have enough in it to fuel her to not give up. To be able to fight against the status quo even if she needed to bleed.
"And just to reiterate, I do not intend to take you or any woman for that matter into my harem. I am not, nor have I ever been, sexually attracted to you or anyone since I came here. I am devoted to the Sirens. So, telling me you love me without warning is not a good reason.""