baserunning question

[PaREF]

I was watching that game, it was a Pittsburgh Pirate runner. The batter hit a long fly to the outfield that appeared headed into the gap between left and center field, but the fielder made a fine running catch. The runner at first had advanced to (nearly) second base when the catch was made. The runner actually stepped over second base (never touched it) and when he stopped, his lead foot was clearly between second and third base. His trailing foot (also never touching second base) never actually passed the base. When he turned to retreat to first, he picked up his trailing foot and pushed off with his lead foot. He returned to first without ever touching second base either while advancing or retreating.

I don't know the exact interpretation but I think that he was ruled to have been past second base because he had one foot on the third base side of second while the other foot was not touching the ground, so he was ruled to have passed second base but did not re-touch the base on the way back to first.