Great glitch for infected 
Trying to land on the barrier in a private match and can’t.
You have to land on the wood part of it
Platform?
This works perfectly. Did this last night and got the flip flop achievement. Just a few tips though that will save you some time. Don’t invite anyone halfway through. If you want friends in, start with them and do the glitch together as inviting friends seems to reset the glitch. Also do the objective rounds. The EMP round will be the hardest and will glitch out if you do not complete it.
I’m on the 360 not sure if it works on others