SWOOOORDS! Colon Lords of the Sword is a 4-player cooperative dungeon crawling action game made in Unity 3D, inspired by Gauntlet, Golden Axe, Bastion, and Spiral Knights.
All attacks cause knockback, so it's often wise to simply knock your enemies to their deaths. Here, the player blocks an incoming attack just in time to perform a counter. The counter stuns the enemy, making for an easy target.