mbcrowder wrotePartner doesn't believe me... so here goes.
No outs, R1 on third takes a lead on the pitch. Batter hits a looping pop toward third base clearly over foul ground. R1 retreats, collides with F5 unintentionally, preventing (in the umpire's opinion) F5 from making the catch. Ball lands foul.
Your call...
ASA - Dead Ball, Interference, R1 out, Batter also out. 8-7-J, (see EXCEPTION after L.
NFHS - Dead Ball, Interference, R1 out. Foul ball, strike added to batters count if less than two strikes. If batter was attempting a bunt with two strikes, batter is out.