SITUATIONAL ANALYSIS

"My friends and I were drinking in a karaoke bar last week. While my friend was singing, one group occupying a table nearby was mimicking my friend. My friend approached the other group and this resulted in a brawl. I ran towards the bar, but a member of the other group chased me. When I went outside the bar, I noticed another friend holding a gun so I immediately grabbed the gun and fired upwards in order to warn the person chasing me. The latter, however, picked up a stone and threw it in my direction thereby hitting my left foot. I fired another shot which hit him, and he died as a consequence. I was charged with homicide, but I think that what I did was an act of self-defense."

What do you think about the person's situation? Should he really be charged with homicide? Or should it have been ruled out as self-defense?