[greymule]

The original post didn't specify the code; that's why I said OBR. The words "as he rounds second" do indicate that this is type B OBS (no play being made at the moment of the OBS), but I pictured type A, where "the runner is obstructed as a fielder is making a direct throw to a base in an attempt to retire that runner" [PBUC]. In other words, I pictured the OBS occurring as the play at 3B was developing, not as the runner rounded 2B with the ball in the outfield.

I believe that the "if any" in "impose such penalties, if any" is mainly a reminder that the umpire doesn't award anything extra if everybody ends up on the base he would have reached without the OBS. But it also implies that an obstructed runner could still be put out after the (type B) OBS.