Is this an infield fly? Can the fielder purposely let a fly ball drop to get a double play? The smartest shortstops in the game know this one rule. Since runners are not on first and second it’s not an infield fly. And the rule is clear that an intentionally dropped ball must touch the fielder, like knocking down a line drive. So this shortstop saw the batter runner jogging down the 1B. And let it drop getting the force out at first. The runner on first should have stayed but by going to second