u make da call
runner on second. ground ball to the shortstop. shortstop muffs it. while retrieving the ball, the shortstop and runner collide. the shortstop gathers the ball. the runner safely gets to third. you make the call? clearly interference has occurred. but interference by whom, the runner or the shortstop? heh. don't ask me. i don't know the answer. rule #1. runners are out if they collide with a fielder fielding a live ball. i don't think this applies because the ball is no longer live as soon as a fielder touches it. rule #2. runners are out if they intentionally interfere with a catch or throw. i guess this could apply if the umpire rules the runner intentionally interfered with the fielder. the rule doesn't specifically mention activities by the fielder other than catching and throwing. but if it didn't apply then a runner should defend a non-live baseball near them so other runners can score. rule #3. runners may advance without jeopardy one base if their progress is impeded by a fielder who does not have the ball. i think this one wins. assuming the runner didn't intentionally smash into the shortstop.