The balk had nothing to do with coming set. A pitcher does not have to come set to throw to first. The balk was called correctly. A pitcher has to step towards the base he is throwing to. When using a jump move like Burns does, the body has to come completely around and be pointed towards 1st base. Take a look at Burns’ body after he completes the pick off. Everything is still pointed towards home plate and that is a balk..Technically Burns balks just about every times he throws to first somebody just finally called it. Don’t be surprised if it gets called more often now.