interference/obstruction?

[Jerry]

Good call, Steve. As you know, not all contact between players is either Obstruction or Interference. Your delayed dead ball call is right on. By definition, obstruction "impedes the progress of any runner." Given the likelihood that R1 would (more than likely) have been out on the force at 2nd anyhow, there was no "progress" that was impeded.

The 1st and 3rd base coaches, of course, would see it entirely differently.

Jerry