The first Heavy Armor Zombie is encountered in "The Keep". They can also be found in "Army of Darkness" and "Horde". An easy way to shoot their head is from behind. In the beginning of "The Keep", a fence will shut down and kill zombies. Behind it are several Heavy Armor Zombies. Some of them only have a partial helmet, leaving the back of their head unprotected. Headshot one of them to earn "Your blood pressure is zero over zero".
