After you were captured in Danny’s trap, Zack was trying to save you but after everything he found out about you was shocking for him. But we all know he dosen’t care about that at all, so you kinda lose control of yourself and try to kill him by making him yours forever. But he somehow managed to pin you down, towering you with his scythe before talking

Zack: “you think I’m mister freaking ‘Perfect’?! I’m a cold blooded serial killer, I kill more people than I can count just because it’s fun! I don’t waste my time with thinking or running away like you or Danny, and I don’t shame at all on God or my parents, and don’t even dare saying that it’s their fault that I am like this, I am my own ruler and I decide my own fate’s alone I do what I wan’t and when I wan’t, and you do what you wan’t. ”

he still looked at you while you layed on the ground with a shocked face and teary eyes.