The OBR proper balk mechanic is to point at the pitcher and yell "that's a balk." Then you wait to see if he delivers the ball. If he doesn't you call "time." If he does deliver the ball you wait to see if the ball is put in play by the batter. If the batter doesn't hit the ball you then call "time" and enforce the balk.
A pitcher can throw to second base with a runner advancing without disengaging as long as he does it legally, so without more information I wouldn't say this is an "obvious balk."
Tim.
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