Hello i wanna suggest an improvement about human class.
every round with a special key bind (like z or x or other key placed by the server not the players) it should give to humans speed for like 3-4sec and invisibility for the same time amount,so it can give human an opportunity to escape when a mass of zombies is after them,since when zombies hit humans it slows them down very much. i think this is also balanced since humans can't spam it during round and also gives them 3-4 sec opportunity to escape the zombies.