It's the way Phoenix takes Miles's so-called "death". I absolutely understand why he would be so mad, but I was pretty shocked to see him blaming Edgeworth for being proud and selfish and aiming for the "perfect record" like the Von Karmas do. The way Phoenix puts it, he thinks Edgeworth couldn't bear having been defeated in court, because it wounded his pride. Now that just doesn't make any sense for me at all. With the kind of pressure Edgeworth has been put under in the first game, even if you don't count the fifth case, one can think of many reasons for him to break down - and loosing face might very well be one of them, but "loosing face" is not the same as "wounded pride". Where the hell did this "wounded pride" theory even come from? Phoenix, of all people, should know that winning in court is hardly a matter of pride for Edgeworth (well, not the selfish kind of pride he refers to anyway), and while I see how he would be offended and a bit too emotional with his judgments at the time, that he would make such accusations is just hysterical.
What's even more confusing, Edgeworth basically agrees with Phoenix, and I don't remember how exactly he phrased it, but it did seem like he generally admits that Phoenix was right with his assumptions.
For me, this whole issue was like dismissing all the intellectual drama of the first game for no reason.