One thing I noticed in the last zone of ShB were mobs being aggressive toward each other. Yes, you see it happening sometimes during FATEs, but here it wasn't the case. The first time I saw a dead mob with its greyed-out name with no other players to be seen but the second time I actually witnessed a mob killing another, like they had a predator/prey sort of dynamic. It was an interesting touch and I've yet to see if it's explained in a side quest or something but I wouldn't mind seeing it happen in other zones if it doesn't already.