Define "Steps off".
The ball is live on a base on balls - and this is not even a trick play. Could just be smart baseball if the team has shown a propensity to run that batter-runner to 2nd on a base-on-balls, especially with other runners on base.
If the batter-runner overran the base and came back - he's not out. If the batter-runner ran to the bag, stopped, and then stepped off - he's out.
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