Bert calm?? Interesting notion.
Halftime/fulltime is within the same game,same day,same conditions (unless you live in Taranaki!),same officials,same core of players, same field/court,etc,etc. All this and your halftime winning team has a points advantage over the other RIGHT THERE AND THEN. Racing multi has two DIFFERENT races, with at least 2 days gap, perhaps different tracks, over perhaps different distances, with probably a more varied personnel/competitors than the 2nd half of a sports event etc, etc.
Apples vs Oranges.