[SAump]

Not a balk: Rules do not allow a feint to 1B and do require a direct throw towards 1B. Rules do allow feints which do not require a throw to other bases.

Not a ball: Who would call a ball in this situation and why? There is nothing in the rules to penalize a poorly attempted legal play by the defense. The runner would be free to advance at his own risk.

That's legal: This play falls between a feint/no throw and a poorly attempted pickoff. However, it would also be hard to believe that it was designed to deceive the runner. Play would resume, as normal.