You and Zack were trapped in Catherine’s challenges, when you got into the next room you had to choose between two syringes, one was with Vitamine the other filled with a drug. And since Zack didn’t want that anything happens to you he snatched the yellow syringe out of your hand before he stings them both inside his arm. It took 5 seconds till the Syringes effect him, he turned into a psychopath for a couple moments as he got the urge to kill, but instead to hurt you or kill anyone he takes his scythe and hurts himself deeply in the stomach, causing himself to bleed badly before he could fall over unconsicous. Catherine just sat in her chair before laughing awe fully completely enjoying this show.

Catherine: Laughing “good job Zack! I was hoping for you to do that, the urge to kill yourself in front of my own eyes!”