Duon

Duon is the 6th boss in the Subspace Emissionary.It is found on the Halberd Bridge.It has two sides that can attack with different battle styles.The pink side uses a gun,while the blue one attacks with a sword.It can swap at will which side attacks,but no matter which side you attack,they'll still take damage,so don't limit your attacks to only one side.The side that is attacking is the one you'll be hitting.