Join Him
From Create Your Own Story
You join in on the killing but Mario wants to kill 'em all and gives you an "I'm pissed" look so you stop. You pull down your gun and he finishes them all off.
The helicopter lands on the roof and it turns out to be a SWAT team copter. The SWAT team was sent for Mario and you. They circle the building and run inside. In seconds, you're dead and Mario is too. You have no regrets because you had fun.
The End.