Two fielders (1st baseman and 2nd baseman) are moving to a fly ball in the baseline between 1st and second, calling each other off, ball is closer to 2nd base then 1st base. Runner from 1st collides with 1st baseman. 2nd baseman drop flyball, possible due to the collision distraction. Is this obstruction or interference? I've seen in baseball rules it is clearly defined that only 1 fielder is protected, is that the same in softball? And also where can I find the clarification that only one fielder is protected?