If the referee was suffering from genuine heatstroke rather than diplomatic heatstroke ( rather cynical I know, I must have been watching too much broadcasting from the House of Commons ! ) then that really does raise important questions about the protocols for a referee's welfare when officiating in very extreme conditions. It does take a bit of believing though when all officials are miked up to each other and presumably are communicating with each other constantly for one of the referee's colleagues not to notice something was wrong and then act upon it.