Reasons Not To Use
Sometimes when this glitch is used they can kill you, because of the high density of zombies they push each other forward into killing range and ,well, kill you.
Sometimes zombies glitch and do strange things e.g. one zombie at level 13 came up the stairs and got hit by the flamethrower, it then proceeded to fall through the floor and explode like an bomb powerup, wiping out all remaining zombies.
Or
1. Zombie runs towards you
2. Zombie gets shot
3. Zombie starts moonwalking away
4. zombie comes back and attacks other zombies
5.Zombie dies on insta-kill and gets revived
^^^^ All Of Those Just Happened To Me, Any Explanation Would Be Welcomed.