premise: A man on one miniature train passes a circular object to a man on another train as they pass by. hypothesis: Two trains of different sizes but following each other side by side going to opposing directions.
neutral: One cannot both pass by and follow each other.  Just because one man is on a miniature train, it does not necessarily mean that the two trains are different sizes.|neutral: it never stated that the trains were different sizes.|neutral: Just because one train is miniature doesn't mean the other train is a different size.