The Riot Zombie has the ability to raise his shield up and hold it in front of him. While doing that, he is invulnable to any melee weapons or firearms, including Milkor MGL. In that case, you have to wait attacking him until he lowers the shield again.
In close combat he has the ability to use his shield and hit the player. This will do damage and knock the player back, stunning him for about one to two seconds.
The Riot zombie's only weak point is its slow movement speed which makes it easy to outrun and avoid him if necessary. Besides that firearms are recommended for fighting him to avoid triggering his 'Shield up' ability and not get stunned by his 'Shield Strike'.
Anyways there is an easier and cheaper way to defeat it, in the room where only one Riot Zombie spawns is located a table which can be used to do a wall trick with medium range weapons (Like the Baseball Bat), after this the second Riot Zombie can be lured to this room.
- Introduced in Beta v.1.9.6