That´s a rare spawn. Still haven´t seen a demo out in the wild during V1.0. Wich is a shame, i like to lure them to a group of Z´s and blow them up. The button is their weakness outside of horde night, so i don´t mind them no matter wich day.
What really grinds my gears here is people not having first aid in the tool belt. That´s a must for me. I would have messed up permadeath games so often already if i would have to go in the inventory for healing or to stop bleeding.