Bunting/Blocking with bat

[collinb]

Federation Rules...Bunting...Situation.
The batter-runner places a bunt in front of home base.Then appears to be carefully throwing bat in front of home base. I think in an effort to position the bat to block the ball from spinning back in foul territory.
Bat and ball make contact a second time in corner of batters box in fair territory.I called dead ball/foul ball because of second contact. I didn't get a argument over the call but the play had me thinking the situation over all night. I went home and tried to confirm ruleing with rule book. I think I could have call interference on batter for deliberately throwing bat out in front to block the ball from spinning back into foul territory. And I don't think I should of call dead ball/foul ball because of second contact if the bat was not still in her hands when second contact occured. Does it matter that this happend within the batters box and fair? I know it would be foul ball if the second contact was in foul territory.
This is a play I have never seen before and one I want to be sure of, with all the varitions next time.