Rupp's coach, Salazar, was on the infield giving splits. This is highly illegal. He was "in the competition area" (see below)
http://www.youtube.com/watch?v=T66mVIA0V7A
Any athlete giving or receiving assistance from within the
competition area during an event shall be warned by the Referee and advised that, if there is any repetition, he will be disqualified from that event.
The following shall not be considered assistance:
(d) Communication between the athletes and their coaches not
placed in the competition area.