In Reach It seems like the system for choosing the new zombie for each new round is totally random, for the most part this is ok except for when the same guy is the zombie over and over again. In H4 i think they should make it so that you can customize the criteria for choosing the new zombie. This way it is predictable and it gives more purpose to the whole game in general if you know what the consequences for your actions will be in the next round. It would also make it easier to make mini-games. the more control the better!