Hint: The manipulator intercepts (and therefore replaces) B in beat 3, just when B is supposed to walk over and becomes C in the following beat 1. A lazy manipulator (as we are) stays close to A, intercepts the pass to B early and just stands next to A, where B would have had to walk to.
This omission of the walkway makes scrambled “3” one of the easiest scrambleds for beginner passers.