Zombies that use melee weapons but limited to one handed weapons
They wildly swing the weapons at you but they do more damage than a regular zombie
On a critical hit they can knock you down or cause a concussion that blurs your screen and faint ringing for 2 seconds (this idea can be optional)
They cannot grapple
Once killed they drop the weapon they were using
This applies to the shield zombies to as they will swing their shield at you if close enough
This encourages the player to be careful when using melee combat on these zombies