Retired Runner Continues to Run

 
With no outs and runners on second base (R2) and first base (R1), the batter hits a fair ground ball to the third baseman. The third baseman fields the ball and steps on third base to easily force out R2. The third baseman then throws to first base to attempt to complete the double play, but the throw is wild, pulls the first baseman off the bag, and B1 is safe at first.
 
Surprisingly, R2 did not realize that he was out on the force play at third base, so he rounded third base and headed home. The first baseman throws home and R2 is tagged out (the second time R2 is called out on this play). Meanwhile R1 and B1 advance to third base and second base.
 
The defensive coach thinks there should be some type of penalty for R2's actions. The offensive coach thinks that the defense should know who is out and who is safe before taking action. What do the umpires do now?
 
Call
A retired runner may not interfere with the defense's attempt to retire other runners (NF 8-4-1).
 
In the situation below, although R2 was retired and then continued to advance, he did not interfere with the defense's attempt to retire another runner. R2's actions are ignored, play continues, and there is no penalty.