When you first unlock Karne with the computer it can be pretty tricky to avoid getting grabbed by the zombie that gets up from the bed. There are two ways to do this. You can face the door while using the computer to make things easier, but you still have enough time to quickturn. In the PS version run to the door and use it, it will teleport you to the other room without any need for further manouvering. In the PC version it's harder because there are no room transitions. When you get to the door make Kenzo face the door slightly with his left shoulder instead of straght on and open it. the zombie will stop and turn around and you will be able to exit the room without being grabbed.