Our Afghan allies, again:
When [stoning] has taken place, it has been under strict religious supervision, after a fair trial, with limits set by religious scholars on the size of the stones — they must be small. The stone-throwers are prohibited from lifting their arms above the head to throw. — NYTimes
Read the whole article for details. Even using large stones hurled at full strength, the crowd failed to kill the 19-year-old victim: she started to crawl out of the execution pit and had to be shot three times in the head. (They did a better job on the 25 year old fiance. Practice makes perfect.)
Despite the unsportsmanlike conduct, no penalty flags were thrown.