If you adjudge that F6 had an opportunity to field the ball, then this is interference on R2. Protection of a fielder can change during the course of a play as it did in this situation from F5 to F6. As an aside, if a fielder and a runner collide, you can’t have “nothing”. You must adjudge interference or obstruction. The only exceptions are the immediate time after a fielder has completed an attempt at fielding a thrown ball such as a 1st baseman and a runner trying to go to second base on an overthrow or tangle/untangle at home plate.
