I have been acquiring many different Perma Perks. This time something very useful came into my grasps. Iv been continuously overcoming fall damage from jumping off the roofs. Also falling through holes and such.
I figured it out eventually in a later game. Here you will see Me as Russman diving to the ground.
We got PHD Flopper!
In conclusion we now have our PHD Flopper! It is so useful in this map. You can take out massive amounts of zombies by jumping off the rooftop or many staircases.
All I did was survive fall damage at least a couple games before achieving this Perma Perk. Hope this was as exciting for you as it was for me!