Obstruction, Interference, Double Play????

[DG]

Let me see if I get the picture. The ball is by F5, F6 fields it and throws to 1B, and sometime during the throw R2 runs into F5. If that is what we have I don't see interference, but possibly see obstruction on F5. F6 was not interfered with and the ball was by F5 when F6 fielded it, and the contact came during F6's throw. I would have to see it to know whether it was obstruction, but it don't sound like interference. On the obstruction, if it was, award 3B to R2. Runner on 1B and 3B, no outs.