Interesting scenario question

[chapmaja]

This was posed on a you make the call segment, by a NCAA DI baseball umpire (who has worked regional and super regional level, if not the CWS).

He applies this ruling to HS baseball and softball, and I'm not suggesting he is wrong, but I'm wondering the rules application if this were to happen.

Nobody on base. Fly ball down the left field line. F9 reaches up attempting to make a catch and touches the ball directly above the line, but fails to secure the catch. The ball deflects off the glove and over the fence on the foul side of the line / pole.

What is the ruling and what's the rule reference? Speaking NFHS here, but what about other codes as well.