I know that at Samurais that followed the Bushido code all their life and mastered the many different techniques (i do not know) sometimes used the sword in sheathed(*) position. It was most often used at the beginning of a battle to counter a hit of the bade, get into position, then draw the sword. In duels, at least, not official ones. 

In one of the many documentaries I listened to, read or watched, it was being said that samurai duels almost looked theatrical. There is so many different position and counter attacks that it looked staged at some point, but was not. o_o This was not only guessed by historians, but documented throughout japan history by Japanese people.

I know that Iaijutsu refer to the art of drawing the blade, more accurately focus and be able to react fast enough. It is only one part of the whole Bushido code, along with all the rest of the arts, Kendo and etc. :D 

Japan history and culture. So fascinating. ._.