Y'know, cinos really had a good idea for how to incorporate the Riot Control skill. Why not?
Riot Control
Description: If a gunman had a shield equipped, a gunman can bat away foes with his shield, knocking them away from him. Pretty useful for self-defense.
Skill Levels: 5
Base Knockback Distance: 4 feet
Knockback Distance per Skill Level: 1 foot
Max Knockback Distance: 8 feet