A couple situations...

[5 sport ref]

I agree with with the majority here ruling interference and game over. The fielder has the right to make the play on the ball and the runner has the responsibility to avoid the fielder. The same as if the ball was a pop up and the infielder was camped in the baseline it would be up to the runner to avoid the contact. Any contact in that situation would be interference.

I've got nothing in the second situation, but would mention it to the coach between innings.