L4D2 Level Design/Wandering Witch
In L4D2, we discover that witches sit and rock themselves only at night. If there's sunlight, they wander. You can control this in your map from the Map > Map Properties... menu item.
If you change Time of day to any time of day when the sun is out, including "
Morning", and "
Afternoon", witches spawned by the Director will wander.