It really depends on how skilled they are at managing the chain. The kyoketsu shoge is similar to the Chinese Whip Chain/Chain Whip and the Rope Dart. They function similarly to whips, and are a more dangerous (to the wielder) cousin of the nunchaku and three section staff. These weapons all work off similar principles about maintaining momentum and using your own body to provide control. This includes your arms, your neck, your shoulders, your legs, and, on occasion, your whole torso.
Whip weapons are one of the most advanced weapons in a martial disciplines for a reason. If you don’t know how to control it, it will hit you. I mean that, it will and it will hurt. Like the boomerang, the whip or chain always comes back. You are at the mercy of the chain, like any fast moving object, it doesn’t stop on a dime and you’ve got to mitigate the momentum until it finally stops.
The advantage of the whip is that it can strike on multiple angles that are nearly impossible to block. It’s not just on diagonals, a chain or a whip will curve. It can be used to disarm an opponent. When you’re working with a whip made entirely of metal like the nine section whip any part of you it strikes is going to hurt like hell.
If you can master a whip, it’s a very useful weapon, though it shouldn’t be the only weapon your character carries. It does require a great deal more skill than the average and, with a whip chain, you should be prepared for pain. It’s also not a weapon your character could pick up and just wield without any formal training. If we’re talking about a formal Chinese martial discipline, this would be a weapon you’d learn after you mastered the others like the staff and the sword.
Chinese Cinema has many excellent examples of the Chinese varieties of these weapons in use and may provide you with some ideas.
The kyoketsu shoge is a little different because it comes with two ends, a bladed end on one that could be used to hook opponents much like one would when fishing and a metal ring on the other. Similar principles to the others in this category apply when it comes generating momentum and to safety, but worth keeping track of when you’re trying to figure out exactly what you want.
When you’re writing, it’s important to remember that the more complex a weapon is in its movements then the more difficult it will be when it comes to actually applying those actions on the page. The whip is a fantastic weapon for cinema because it’s dazzling. It’s in constant motion, it makes wide sweeping arcs, it’s often too fast for the eye to completely follow, and it’s just fun to watch. You don’t get that luxury when you’re writing. You don’t benefit from visually interesting weapons unless you figure out how to tease the imagination when the audience tries to visualize.
The best way to write weapons, especially complex ones, is grasping the underlying principles of how the weapon is supposed to work. You are at advantage over the practitioner because you only need the principle, as a writer you can simulate the experience. However, you’re at a disadvantage because you’ve never tried to work with one and don’t have the ground level experience of trying to get the weapon to work.
When you want to use a chain weapon like the whip chain in an action sequence, its important to remember that your character needs to keep it in constant motion. The weapon is only deadly when it’s in motion. You throw it out, spin it, wheel it about using your throat, catch on the shoulder, throw it back for another strike. They’re going to need space to use it, which means it’s at a disadvantage in cramped quarters.
What’s going to sell your whip in a written action scene is remembering all the tiny little physical motions that go into maintaining control. Whether it’s snapping the wrist to crack the whip, remembering that the guiding hand controls the whip and the other holds, to wrapping it around the body at the fight’s end to catch and negate the final momentum, what sells the weapon is your ability to accurately represent how it moves in the real world.
A lot of writers try for technical terms as a way to communicate what they’re talking about, my advice is learn them as necessary but don’t assume they’ll do the work for you. Assume your audience is ignorant and focus more on what the weapon does/is supposed to do/the purpose it served in battle rather than terminology. The more complex the weapon is in movement, control, and execution, the more difficult it is to write.
If you do get frustrated during your research, just remember: you jumped straight to the end. The whip chain is a complicated weapon, it’s supposed to be difficult.
If you’ve never used a whip before, this is going to mean watching a lot of tutorials on Youtube and reviewing many an action sequence where the whip is used as primary or secondary weapon.