1. When Christian Bale gets shot up. 2. When Russel Crowe kills his henchmen, mainly the kick butt dude in the awesome jacket, because all he was doing was trying to save his boss.
I felt sad mostly about reason 1. It's sad that the son had to watch his dad die as he was about to make it. I thought the guy in the awesome jacket was a big douche :/. But I get what you're saying about him trying to save his boss.