Though your names speaks of a jest, I believe you're right. You've convinced me, Luca, an obviously powerful, distraught spirit, now has my eye. Twixt her and Rahel, I sense a lot of pain from their earlier lives. However, that scene was likely little more than an act to scare them off. Though, I still like Set... and I'm interested to see how his kind-heartened temperament... is likely to change...
I can see him being severely distraught and forced into action then feeling quite guilty about it, and spacing everybody away through his shields. As a spirit, Luca is the only one to pass through them. Seeing the deep scars of pain within Set, Luca approaches him. Through some great characterization, Luca's "icy heart" is warmed and Set is up and happy once again, especially now as he has developed on bond of friendship with Luca.
I love all the characters really. It all depends on how well this tale is spun, and, as of yet, it's been weaved quite profoundly.