I don't recall the devs ever claiming that players should be forced to team up and avoid 'lone wolfing', being alone is meant to be very difficult, but that doesn't mean being in a group should be a cakewalk, currently that's all knockdown really presents. Knockdown as it is presents no challenge to groups and instead of providing great challenge to individuals it's more of a roll of the dice or the result of the inevitable glitched zombie. There are a couple of issues with the zombies that if corrected would make knockdown a non-issue, namely the ghosting through objects and wild zigzag running that forces you to choose between being hit or wasting tons of ammo and possibly be hit while reloading anyway. Unfortunately these issues look like they're the results of the game engine so the only thing that can be changed is the mechanics of knockdown. My suggestion would be to make pain a meter like hunger and thirst is. In addition to the visual distortion, once you reach a certain point it becomes possible to be knocked out (through fainting) with intervals increasing the more you're in pain. IMO this would still present a significant challenge, but remove some of the randomness, it could also make epi-pens more useful. Tajin pointed out that you can easily kill zombie hordes just by running into buildings and taking them on, one by one. Examples like this where something that's extremely difficult can be made into a cakewalk just by using one technique (possibly glitch/exploit) are not examples of good game design. There should be no move in a fighting game that beats all others, there should be no gun in an fps that's just as easy to acquire but is far superior to every other one. These are just examples of poor balancing. Therefore teaming up shouldn't be the magic bullet that makes knockdown a non-issue. It should make things a lot easier, but making surviving as a team dull and easy while surviving as an individual inevitably impossible is not really fun whichever way you choose to play.