I've listened to and saved everyone involved in a scoop so far, and I found one that wasn't.
Those are gonna be a bitch to find without a guide. I've already fucked up and skipped over Snowflake.
I'm level 23 right now, the speed boost is nice. And I played with a guy that showed me how to make a Defiler. That's a bomb-ass weapon. Axe+Sledgehammer, Willie. It kills good. So do the knife gloves, as a matter of fact.