From the Heike Jodan Scroll of Natori Ryu
WALKING AT NIGHT WITH A CANE People of all ages use a cane when walking at night and there are things you should keep in mind about them. If you are attacked with anything bladed or with a staff, then do not fight with the cane. Otherwise you will not have time to draw your own sword later on. Therefore, be aware that canes are only an aid for walking in the street. This is not the case with a shikomizue, a cane with a hidden element, as it can become a chigiriki – a cane with a chain.
THE CHIGIRIKI OR THE TOBIGANE TOOL This is a ball upon a chain and is sometimes attached to a staff, which is called a chigiriki-zue. This should be thrown over the enemy. (This is from a section on capturing, in what I would describe as being deputised to do so. It also deals with rope).