R2 has touched second base and third base when he collides with the third-base coach who is in the baseline watching the possible play at home plate. Before R1 touches home plate, the throw is cut off and thrown to third base where R2 slides back safely. The play stands with R1 scoring, R2 at third base and B5 at second base. This is not interference by the third-base coach. If he were to assist R2 in getting up, this would then be interference by the coach.
Runners are on first and second with no outs.
The batter hits a blooper to short right field. The right fielder slides on his seat, juggling the ball. The ball pops out and hits the ground. Both runners have stayed on their base expecting the ball to be caught. The right fielder then picks up the ball and throws it to the shortstop, who tags the runner at second, who has stayed at second base.