Then there's something missing. You can certainly deploy a weapon and deadly force under the appropriate threat. Duty to Retreat is negated by immediate threat.
Peace favor your sword,
Kirk
What is missing is the inclusion of past cases where the jury convicted the person defending themselves due to what was seen as excessive use of force (overkill) or failure to retreat (not sure what you mean by "negated by immediate threat".
I feel that a disclaimer and reminder of the law as it regards to unregistered lethal weapons used for any other purpose than collector/hobby is prudent.
[quote = Wikipedia]As to carrying weapons in anticipation of an attack, Evans v Hughes (1972) 3 A ER 412 held that for a defendant to justify his possession of a metal bar on a public highway, he had to show that there was an imminent particular threat affecting the particular circumstances in which the weapon was carried. Similarly, in Taylor v Mucklow (1973) CLR 750 a building owner was held to be using an unreasonable degree of force in carrying a loaded airgun against a builder who was demolishing a new extension because his bills were unpaid. More dramatically, in AG's Reference (No 2 of 1983) (1984) 1 AER 988 Lane CJ. held that a defendant who manufactured ten petrol bombs to defend his shop during the Toxteth riots could set up the defence of showing that he possessed an explosive substance "for a lawful purpose" if he could establish that he was acting in self-defence to protect himself or his family or property against an imminent and apprehended attack by means which he believed to be no more than reasonably necessary to meet the attack[/quote]
So, you see the problem that exists as to when you can carry and use anything other than a registered weapon for self defense, and even then you can expect a jury to wonder why you were in a situation so dangerous that you had to train and use archaic blunt or sharpened weapons. That is a rare case indeed. As it was said, the bat should be kept with gloves and a ball.
But I would recommend leaving the nunchucku, bo staff, and katana at home.
Besides, there is a greater chance that you will get struck with lighting or eaten by a shark than needing deadly force to escape a threating situation in this lifetime. The key is to not get in one in the first place. If you are in one you can't escape, then your life has some darker parts to it than the average person, and you should be carrying a registered firearm and have 911 on speed dial at that point.