I found this question and answer particularly interesting:
Interviewer: If you could do anything for Lee -- any episode, no getting permission from the boss, dream set, no budget, do anything -- what would be the ultimate fantasy? What would you like to do for Lee?
JB: Um, I would like him to make a huge, huge miscalculation. A huge mistake. To really screw up in a major way. That cost people their lives and for him to have to deal with it. I like it when ... what our show really does do is problamatize heroism. All the archetypes we think characters are going to be.
Of all the characters, I think Lee is the most conscious, conscience-driven, and he tries to do the right thing at all times and he thinks about his actions. I think it would be great to have him think he's doing the right thing but to do something that really, really, really screws up and costs lives, real lives, and to see how he deals with it