What was Arno's story in this? (spoilers)
Unless I missed it, the movie doesn't explain much about why Arno is such a heavy. And the way it ended, with Arno dead, made me wonder how much of a heavy he really was? In the real world, killing your boss like that would mean that the boss's boss would simply kill you in turn, so it doesn't really happen. Unless Arno was just a bit player who hired goons he couldn't control?
That part of ending left me scratching my head. They could have just as easily kept Arno alive.