largeone,
The motion to come fully "set" must be continuous, FED and OBR.
Reference:
J/R (Assumes "in-contact" pitcher and at least one runner)
"It is a balk if a pitcher
1. hesitates in or interrupts his motion to join hands, pitch, throw, or disengage. [8.01b] [NFHS 6-1-1]"
J/R goes on to explain that a pitcher who begins the motion of coming set is not necessarily required to complete it. He may "change" his motion to coming set into a throw to a base or disengage as long as he does it "in a fluid and continuous motion".
JM
(Edited to correct typo)
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