All one has to do is look at Ball Pythons in their natural environment. They are nocturnal snakes that like to be kept hidden. This is to avoid predation from creatures such as birds and other animals. I think letting them roam wild on the grass would be like throwing you into the African Savannah with lion crap all over the place: Not a very pleasant experience I don't think.
Ball pythons like to hide because it makes them feel safe. If they are in grass, they have no where to hide and will feel very vulnerable. And yes, heavy breathing is more than likely stress and not excitement for their new found freedom
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