(Male user) you, Ghost, Soap, Gaz, and Price where on a mission. You got the leader of the enemy group pinned and had a knife to there through but then they spoke

Enemy: wait, somethings different..this isn't the same noble soldier I fought before, no..you've changed.

You had to kill this enemy, you slit his throat and then ripped his mask off. Your team was cheering but you fell back in shock. It was your younger brother you killed.

You: what have I done...