1 minute ago, shosuko said:If you used a katana and wakizashi that were on the shorter end you could easily double draw. Many people either assume there is 1 standardized length for a sword to be, or tend to want the longer sword for the advantage of reach... but if you forgo reach in favor of being able to draw a blade quickly with just 1 hand you could apply some unorthodox styles to catch your opponent's off guard. I don't imagine you would draw them at the same time, but the advantage of 2 swords against 1 is kinda obvious. In 1 sword vs 1 sword the main issue becomes - how do you get by your opponent's sword while still using your sword to strike. In 2 sword vs 1 sword you use one of them as a parry instrument and the other to strike. I would imagine drawing the katana with the opponent's draw to hold their blade aside while drawing the wakizashi to give a quick stab or slice while their sword is bound up with yours.
I don't want to derail this so I'm going to make my point and then move on. Brief background: trained for several years primarily in aikido and somewhat katori shinto ryu. I wold describe myself as an experienced fan of martial arts but by no means a master.
Let's begin with the purpose of iaijutsu. Despite it's depiction in l5r, iai was intended primarily as a response to ambushes. While it did have dueling applications (lulling an opponent into a false sense of security) most stories of masters starting with blades sheathed are apocryphal at best (though there are some reliable stories that suggested it happened occasionally). Instead, iai was used mostly as a way of responding to an unexpected attack; it's for this reason a good number of iai kata begin from a seated position. As such, the moment we start talking about the realism of iaijutsu in l5r we're on shaky ground since real iai was never intended for the role it serves in the game. The means we're intentionally being cinematic and a bit of willing suspension of disbelief is the price of entry.
Next, let's go into the process of iaijutsu. Most iai kata have four stages: stance, draw, strike, and return. Keeping in mind that kata tend to be a very formalized method of practice intended to train the body for instant response, real world application would often differ (i.e. due to the emphasis on responding to unexpected attacks, real iai didn't often permit the opportunity to take stance). Stance in an l5r duel could vary a great deal, just as the stances in real iai could differ a great deal. If an iaidoka had to be prepared to draw from any position, and the kata reflect this, it seems viable that a Rokugani samurai could use any stance. Thus let us assume that a duelist may start from any stance from the classic Crane standing with an upturned palm over the hilt to a Dragon standing with arms in a neutral position (swords drawn or not) to something even more esoteric. I really would like to see a duel in a fic that begins with someone sitting or kneeling, but I digress.
The next stage is the draw. This involves two double-actions. The first is the iaidoka must take hold of the sword's hilt in one hand and the saya in the other hand. The second is the iaidoka would pull the sword forward with one hand while pulling the saya back with the other. (note: I'm leaving out several other things like disengaging the habaki but they're not directly pertinent). This accomplishes two things: the first, and most important is that it cut the amount of time required to draw the sword in half. If a sword of length is moving away from a saya it will take a certain amount of time to clear the saya, but if the saya is moving away at the same speed, the sword will clear the saya in half the time. The second is that it prevents the iaidoka from overextending themself - if the sword is 30" long then the iaidoka would need to extend the sword 30" to clear the saya which means they would need to reach 30" forward, which would be right in the path of their opponent's blade. If the saya moved back half that distance then the iaidoka can move the sword from much closer to their body which prevents overextension and creates more power and control.
The end result is that any effective iaido draw would necessitate two hands. If one hand is busy trying to draw a second blade it's simply going to be ineffective.
A few minutes on YouTube can show some wonderful examples of iaido, both as solo kata and as a partnered exercise. One can see these principles at play right away. Likewise, one can also see videos of modern kendo tournaments which do permit niten-style dual wielding; it's an effective strategy but not a dominant one by any means. Curiously, most surviving forms of Japanese swordsmanship that employ two swords use the wakizashi not as a defensive weapon but as an offensive weapon, used to beat the opponent's sword out of the way to open up an avenue for attack.
Again, all of this is about realism which shouldn't matter terribly much. L5r is a made-up game about magical samurai. The same things that I find cool and cinematic often drive other people insane (i.e. most Unicorn cavalry should be horse archers, but then again so should most samurai). If someone really gets bent out of shape about dueling, wait until they find out about shugenja.