It will keep on hopping towards and it will "throw" itself at the player, dealing slight damage. Keep your attention to the ground when on levels containing this enemy because it is much smaller than you.
It is normally a "decapitated" head from an Injured Zombie.
- This head is similar to other enemies that only has heads.
- It could be the Headless Injured Zombie's head.
- Oddly, with anything but a sniper weapon, it shows players can't get a headshot on it.