G4 has posted this 12 minute video of Left 4 Dead 2′s realism mode. Don’t have 12 minutes? Lemme break it down for you, like this. Only headshots will kill zombies, dead players can only be brought back to life with defibrillators(and you can’t carry a defibrillator AND a med pack), you have to be VERY close to an item to actually grab it, and there are witches. Lots of witches. The new walking kind of witches. Of note is that realism is something that is toggled on and off, it is not a difficulty level. So you can apply realism mode to even easy games.