TIL a new ninja move. It's not very complicated, but many may not realize it's possible. I've been playing this game since it came out on xbox 360, now playing on XBONE. Only recently did I discover this, and it makes stealth kills a lot more feasible and fun. 1. Crouch. 2. Sneak up behind a zombie, but don't get too close. 3. Use LB + B to roll up to the oblivious zombie. 4. Before the roll is over, use LB + Y to stealth kill the zombie. 5. Ninjas make so much more sense forever.