problem with the infected creatures

[eliasfrost]

And the one that showed up with the flashlight in Overture never moved away all the time I hid behind the desk.

You mean Black Plague? Because there are no infected in Overture. In any case, it's pretty easy to just run away from them, if they attack you from distance, they will jump towards you, you just need to run sideways away from it and it will definitely miss you.

Is this normal, do they have to be attacked or killed?
I currently don't have any weapons in Black Plague.

They cannot be killed, or at least I don't think so. The friction of your throws are not great enough to actually damage the infected. And before I forget, there are no weapons whatsoever in Black Plague.