Hello - parasites that live in the lower colon area - pinworms, hookworms and some roundworms - WILL come out half dead and still moving around a little. That is because they don't have far to go out of the body. They are poisoned and sick, but not totally dead. Other species of visible parasites like pork tapeworms, live farther up in the body and by the time they are eliminated in the stool - the body has had time to break them down into an almost unrecognizeable state.
It just depends on WHERE they were in the body when the herbal "poisons" got to them. One other note - liver flukes will always come out whole - they LIVE in digestive enzymes, so the body can't break them down at all. The bile has no effect on them. This is why so many people can see their flukes.
This system of removal is also why so many people will believe that they have pinworms - they are SO easy to actually see - while the same people will have a much harder time believing that they might have parasites elsewhere in the body - not so easy to see.