I havent been playing much zombie survival recently but just tested this class and i see absolutely no reason for it to be in the game whatsoever. Running has always been a vital part of zs which i guess sadly has been phased out the last couple of years due to inconsiderate updates making it basically dead at this point due to how hard it is. You already had to be pretty skilled to stay outside past wave 2 and you were most likely dead if zombies decided to go for you. I dont know why this was added but its pretty much a death sentence for running and removes much of the variety zs once had which i find quite regrettable.