ygyo,
If the R1 is attempting to steal 2B when the pitcher makes this move, it is perfectly legal - i.e., not a balk.
Reference:
8.05
Quote:
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(d) The pitcher, while touching his plate, throws, or feints a throw to an unoccupied base, except for the purpose of making a play;
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Although 2B IS "unoccupied", since the pitcher is throwing there "for the purpose of making a (legitimate) play", he is legal.
JM