SPX: Fleshpound, learn the rage animation and keep shooting it in the head till it pops.Then either keep shooting till head pops off or switch to magnum and finish it off. SPX: Scrake, shoot it in the head 3 times for it to stun.M14: Fleshpound, you need to learn the rage animation as you continuously shoot it in the head.If you want to save ammo, switch to magnum and finish it off after you stun it. M14: Scrake you shoot 4 times in the head and it is stunned.