Balk? To 2nd

Set position, pitcher makes slow mo leg kick, r2 breaks to 3rd, pitcher, still on rubber, steps to SIS and throws to 3rd!!!
Balk, no balk?
Please pass on your thoughts…thanks

Balk. To avoid a balk, you have to put your feet back down on the ground and stand in the position you were in right before you started to wind up (even if its just for a half a second) and then you can throw to third. same with a runner stealing second