force play slide rule?

[CO ump]

Originally Posted by tcarilli

This is wrong, the existence or nonexistence of a play does not matter.



Unfortunately, by rule, you have interference here. Whether you should pass on it or not is another matter all together.

Understand for those of who believe that since there was no play there was no interference, you are wrong. Given that requiring that there be a play to enforce the rule would give R1 an opportunity to wreck middle infielders if he were sure that the middle infielder would or could not make a play at first.

From tcarilli's post

A.R.—If contact occurs on top of the base as a result of a “pop-up” slide, this contact is legal.

c. Actions by a runner are illegal and interference shall be called if:
(1) The runner slides or runs out of the base line in the direction of the fielder and alters the play of a fielder (with or without contact);
(2) The runner uses a rolling or cross-body slide and either makes contact with or alters the play of a fielder;
(3) The runner’s raised leg makes contact higher than the fielder’s knee when in a standing position;
(4) The runner slashes or kicks the fielder with either leg; or
(5) The runner illegally slides toward or contacts the fielder even if the
fielder makes no attempt to throw to complete a play.

From OP
F4 is standing on the back of the bag

Based on the OP I don't think any of the above 5 conditions were met.
According to OP contact was made on top of the base, though it wasn't a pop up slide I think the principle is intact.

#5 is the only possible condition that could pertain to the OP, but since contact was made on top of the bag I don't think it was illegal contact.