Pitch behind the back

[emaxos]

Thought I would get your reactions to this.
Sophomore pitcher at an SEC university will occasionally throw a pitch from behind her back, usually for strike three. She has been doing this from her high school days. Easy to miss if your not watching her carefully; velocity and accuracy are equal to her normal delivery.
Obviously the coach allows her do do it. I was told it was judged by the SEC as a legal pitch. She does this in a game situation, not in an exhibition.
Personally, I think it's a bit unprofessional and an attempt to show up a batter. However, it's quite a feat to make it as accurately and quickly as she does.
Only question I have is about an attempt to deceive the batter by altering her release point.