Javelin throwers deliberately foul during a throw as a courtesy to save time for officials. When a throw is clearly going to be poor and not competitive or counted for a medal, the thrower steps over the foul line intentionally so the throw does not need to be measured. This deliberate foul helps speed up the competition by avoiding unnecessary measurements of bad throws that won't impact the outcome. It is common in regular javelin competitions but less sensible in combined events like the decathlon, where every score counts.