Trainwreck or OBS?

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In NCAA rules, as R3 is heading hard for home AND F2 (not setting up in the baseline) is taken into the baseline by an incoming throw from the outfield and is just about to receive the throw (not in possession of the ball), both R3 and F2 collide inadvertently with each other sending the ball over toward the 3rd base dugout, is this regarded as OBS by F2 or just a trainwreck?

In OBR it would be a trainwreck; in FED probabably OBS. How does NCAA treat such a collision?