Joe Kelly, your intuition serves you well. Some commenters here offered scant descriptions of what happened. Some of us saw it live. First, this kind of 'aribtrary' rule (13-3) lends itself to abuse by biased TV color commentators and/or officials. i.e., if you want to be an true jerk you can by trying to hold someone to some arbitrary 'letter of the law.' Doesn't everyone virtually 'build a foundation or stance' in the bunker by stepping into the sand as they approach the ball, then GRIND/TWIST their feet into the sand a couple of inches for a fews seconds+ (displacing sand) to 'establish a foundation' for hitting the ball!!! Others say they know of players known to do similar to Ahn yet were never penalized. Why? This poor girl put her left foot on a vertical wall to get a stance to hit the shot and the sand collapsed. So she tried to dig in like other players do on every bunker shot. But one can't twist their left foot into a vertical wall. You have to move your foot back and forth briefly like she did to 'firm up your stance.' When this occured on TV, ESPN2 broadcaster Dottie Pepper essentially yelled 'fire,' -VIOLATION, TWO STROKES. She called to have Ahn docked 2 shots and wouldn't stop talking about it. ESPN2 repeatedly showed replay video of Ahn in sandtrap on 18th until officials were essentially backed into a corner to penalize her (although some might feel they were all too happy to do so). After Ahn finished, ESPN2 broadcasters raced to bring this to the attention of rules officials, who expectedly docked her 2 strokes. Would ESPN2/Dottie Pepper have done this to Lexi Thompson, Stacy Lewis, or Paula Creamer? Are you kidding?!! Of course not!!! And to poor salt into the wound, ESPN2 continually brought up on Sunday's broadcast, Ahn's 2 stroke penalty from the prevoius day (seemed like 7 times+). Yet when Shanshan Feng of China was in a bunker on the back 9 on Sunday, she approached the ball and grinded both feet into the sand for a few seconds, 'DISPLACING' sand. But before hitting the ball, she grinded her left foot into the sand even MORE. Yet Dottie Pepper was no where to be found yelling, 'VIOLATION' ON FENG OF CHINA.'
Was this another example of racism by ESPN2/LPGA/Dottie Pepper? Let's not forget that some 5-6 years ago LPGA arrogantly tried to enforce an 'english-only' rule for golfers, that many believed was a devious effort to cut in half the number of Korean players on the tour. This rightly earned the world's backlash of racism charges against LPGA. But make no mistake. LPGA is not biased against Asian players. It's the Korean Asians they don't like (jealousy, envy because of their dominance on tour in terms of wins and money earnings). Anyone who's hung in LPGA circles is aware of the racist bias against the Koreans. It has even poisoned the attitude of some fans walking in the galleries who sometimes mutter under their breath untrue statements that the Koreans speak no english et. al.
Others have said one could identify other situations (on youtube) where LPGA violations occured yet broadcasters from ESPN2/GChannel failed to bring attention to it. Why?
Recenlty GChannel and LPGA publications have seemingly gloated that American players are BACK on top with 2014 wins, and that SKorean players have stumbled. Has the racism (jealousy/envy) against SKorean players resurfaced in a bold attack of Ahn at British Open in hopes of keeping her off the winner's podium? U decide. Some say it would seem so since Lexi, Stacy wouldn't get that kind of shaft. Bottomline is the Ahn payed the price for DPepper's pursuit of her. After all it's almost impossible for a player to overcome that kind of humiliaton at the hands of one Dottie Pepper and play well the next day. And yes, Ahn didn't play so great on Sunday as expected, while the day before everyone KNEW she was the player to beat. People in the know say one thing LPGA does not like is for a non-speaking english Korean to appear on the winner's podium. And BTW, Ahn is not fluent in english as of yet. hmmm
Anyone familiar with GChannel LPGA coverage knows they consistently minimize coverage of LPGA Korean players on broadcasts (unless they happen to be in the top 3...). In past years many have noticed numerous, critical comments of Korean players’ play while putting positive spin on exact same play of other players (in hopes of ‘poisoning’ viewers against K players?) e.g., 2 players can miss a putt exactly the same way. But the SKorean player ‘just totally misread, mishit and blew that putt’ while other player's ‘ball just decided to go right of the hole for some strange reason!’ Since there are less Koreans on tour now, GC reportedly doesn't engage in this kind of attacks much anymore.
If you are an Asian or Korean player representing another country (e.g.,Michelle Wie-US, Lydia Ko-Australia. Yani Tseng-Taiwan etc) then GC seems to give you more coverage with little negative commentary to boot. The bias is obvious for all to see. Yet colluders will say when 6' weeds are pointed to in the garden, 'I don't see any weeds in the garden!'
Ref.: “Rule 13-3 states that a player is entitled to place feet firmly in taking a stance, but must not build a stance.” (difference between grinding your feet into sand like most pros do vs. 'building a stance.' sound like a bunch of horse___t?)