Typical.
They did something similar in the 2003 Cricket World Cup. Sean Pollock the Springbok captain sent a note onto the field to his batsman saying they needed a certain figure to win as the match was about to be stopped because of a impending tropical storm in Durban. However he miscalculated by one run which meant the match was drawn with Sri Lanka who qualified instead.
Yes, Mark Boucher had heroically hit a 6 to get them what they thought was 1 run ahead of where they need to be, if rain stopped play for good* - the note came out, he then blocked the next ball that he could easily have got another run off, the rain came and they were in fact equal and they went out on run rate, cricket's equivalent of goal difference.
* the non cricketers will have stopped reading by now but that was the 5th ball of the over and they WERE one run ahead at the time, 20.5 ovs, however one ball later at the end of the over (21ovs) it was level. Pollocks instructions were not to lose a wicket off the last ball (as it would have sent them behind the rate due to amount of wickets lost)