In your scenario#1 I have nothing but play on. Once the ball passes a fielder (other than the Pitcher) it's a live ball.
Scenario #2 gets a little complicated, where is the fielder in relation to the ball? The fielder has the right to play the ball free from interference from the baserunner. Again as in scenario #1 if the ball has passed the fielder the base runner may have no liability here either. Your scenarios are really HTBT to see the play unfold.
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