This requires 2 people. More than 2 messes it up. Obtain enough points to each buy yourselves a random weapon. But when going to the power room, make sure to open the door that leads to the room with the dog cages and brains. Not the door that leads to the furnace room. After that, complete the round you are on. Then, one person must go back into the room you start in and stand next to the door that you did not open yet. If you are facing that door, you should stand on the left side of it. Then, the other person must sprint to the same door, but on the other side. That person must stand next to a pole in the corner. In the first minute of doing it, zombies should still be attacking but don't worry, after a minute the glitch will be in effect. The zombies will be confused and start hording up on the other side of the map. As soon as they do that, toss grenades at them and rack up the points. But make sure no one leaves. If you do, it cancels and they will run at you. The only thing to watch out for is stray zombies that might come after you. but they usually only come in packs of one or two. Also, the person standing next to the pole has to watch the window directly across from them, as zombies spawning from there are immune to the glitch. Have fun and please post questions as this glitch is hard to explain w/o a video.

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