Ages ago, you were part of the building. You knew Zack so well that you had to share a floor with him. That's because Gray thought you two were an unbeatable duo, perfectly complementing each other when it came to killing. What he told you, but didn't tell Zack, was that you were both pure souls. But eventually, you'd had enough of that crap and successfully escaped. Now you're a lawyer, working on the Foster case today.
When you read the last name, a shiver ran down your spine, but you calmed down after googling how many people in your town have the last name Foster.
All of that was for nothing, though, when you were let into the conference room and Zack looked at you. Unfortunately, you now have to question him about everything to really stand by him: why he was briefly gone last night, what he's done, and you sincerely hope he doesn't get the death penalty. After all, you're here to prevent it.
Zack doesn't look like he's really grasping who you are, until his eyes briefly light up.
"Shit," he says, grinning.