14U travel game. ASA Rules.
1. Hard ground ball to right field. Batter/runner trying to round 1B and runs into 1B hard in the back who is holding her position on bag in case of a possible throw to 1B. No throw was made to 1B. Right fielder held the ball and would not have made an out at 1B even if she threw it. The runner also would not have made it to 2B even if the 1B wasn't there. The hit to the back of the 1B was very hard. Not hard enough to knock her down, but enough to look like a strong shove and knock her off balance and scare her a bit. Umpire calls obstruction. Can the runner be ejected for a hard shove? Basically 1B is in the way of the runner. How much contact do they need to make?
2. Play at the plate. Catcher standing several feet up the baseline waiting for throw. Does not have ball but ball is in flight. Runner runs through catcher, knocks her down and makes it to home plate. Is this obstruction on the catcher? Can the runner be ejected or called out for running into catcher that hard? Would it be different if the catcher had the ball and she got run over?
3. Runner at 1B. Catcher throws a pickoff, runner goes back to base, but knocks down 1B who is somewhat in her way (there is some space to get back to the bag; but the runner goes back hard through first baseman who can't catch the ball because of the contact from the runner coming back hard). Is that obstruction on 1B? or interference on the runner?
Not that it matters, but coincidentally its the same runner for all plays. Big strong girl.