BS call on the umpire. There has to be some sort of an attempt or slight movement towards 2B, I watched this over several times and a little shoulder move or being off the line does not count. The player can return to the base by turning to the left. He is out all day with even the slightest movement towards 2B. The only thing I see working against the runner is the 1B coach motioning him back to the bag probably gave the umpire some ammunition.