Weird "is it a Balk"?

[dileonardoja]

13U OBR, R1 & R3. F1 comes set, R1 takes off for 2B while F1 is set. F1, while engaged wheels around to throw to second but noticing that no one is covering holds onto the ball. OC wants a balk for a myriad of reasons (he didn't disengage, attempted to throw to an unoccupied base and what ever else he was hollering about).

I had no attempt to commit to pitch, he gained distance toward 2B in an attempt to make a play there. However it turned into a feint when F1 didn't release the ball.

So in the end we had a feint to an unoccupied base in an attempt to make a play. Is that a balk?