This is a kind of strange glitch, first make sure you have a way to bound a weapon to your self, and have a horse near by.
Summen the weapon (Type does not matter, nor does the way you summen it) and get on the horse, there should be a message saying "You cannot unequip this item" and the icon telling you how much time is left in the summen will dissapear. Now get off the horse, sometimes you can still use the weapon, other times you will go into hand to hand combat, with the weapon in your hand!(Sometimes it will alternate as well)
Be carefull though! If you equip another weapon the game will freeze.
Kind of odd, but fun none the less.
The Sun and Moon transform day to night, but what transforms the mind?
The best techniques are passed on by the survivors.