Double knife goes hand in hand with double sword training / skills.
Recommend you query regarding Mike Echanis' first combatives knife book (Black Cover) which covers in a very comprehensive, no nonsense way the art and worth of learning how to fight effectively with two knives.
The Filipino arts can certainly provide instruction in this skill, as well. Double stick fighting, for example, is same thought process as double knife. The transition is centered in the unique differences in the weapons being trained.
You can utilize two of the same knives, or mix as you are capable of handling and for specific and practical reasons.
Traditionally double knife sees one knife held in the forward grip, the second held in a reverse grip. This allows for the accomplished fighter to flow through the distance changes that occur swiftly during a fight. Forward grip for long range, reverse grip for when the all-important "gap" is bridged and your strikes must be powerful and delivered in extremely tight quarters in a swift manner.
Double knife also includes the ability to change grips with either knife instantly. This way you can flow with the battle, use different strikes and tactics, change your strategy, and confuse / divert your opponent's attention by such meaningful grip changes.
Carry-wise the most practical and legal where you primarily live and work is what you must explore and determine. Sexy in knife combatives is stupid. Complicated systems or sheathes are stupid. The draw must be swift, sure, and uncomplicated. You will likewise want to be able to return the knife, or knives, to their sheathes as quickly and easily as possible.
Contrary to one posting on this subject the laws in Oregon do not allow for a police officer to arrest you for having your keys in your pocket.
Oregon law and the State Constitution is very clear in these areas anymore. If such an arrest were to be made as described by the poster, the case would most likely be tossed at the DA's level and the officer required to do some homework by his or her department.
The only group of folks who are truly affected by Oregon knife laws are convicted felons. They can run into a restricted weapon charge under Oregon Statute. This, again, will be the DA's call as to how far such a charge is pursued.
Oregon recently saw further clarification in favor of the knife carrying citizen which likewise clarified for law enforcement the issue of blade carry and possession, to include concealed carry when it comes to knives.
Again, do your own homework on such matters. Call the local police; contact a deputy DA, head for the law library and look the applicable laws up; and then have clarified, if necessary. Worth the time, saves you headache and $$, and you will know for sure rather than relying upon some unknown "voice" out in cyberspace.
Double knife is first and foremost an exciting way to train and develop excellent coordination, balance, and discipline. It's fun, few actually train in this manner, and it opens up a whole new world of defensive fighting thought processes (After all, we most often fight with two hands, two elbows, two fists, two legs, two knees, two feet, and two eyes / ears! All controlled and directed by only ONE brain!)
Explore and enjoy
