Top of inning: R1 on 1B. B2 hits a "routine" fly ball that can be caught with "ordinary effort" by F4. R1 runs into F4; ball falls to the ground. I rule R1 out on interference; BR out on "routine - ordinary effort" rule.
Bottom of inning: R1 on 1B. B2 hits a fly ball with a low arch toward F3. R1 runs into F3 who is making a valiant effort to field the ball. I rule the fly ball was not "routine", so I call R1 out in interference and award BR 1B.
Explanation to coach follows.
I'm looking forward to it.