Detecting OBS on steal attempts

[Skahtboi]

Did the runner do anything to make you feel that she was impeded? (i.e. deviate in her running path, slow down, start an earlier than usual slide)

If not, then I would say that you have an out. Remember, OBS is two fold. It requires a) the defender, without possession of the ball, to be in the path of the runner and, b) that "blocking action" has to cause the runner to deviate, in some way, from their usual running path.