Intractor Blade (Projectile)

A projectile long range secondary weapon that attaches to an enemy and pulls Ryu towards him; enemy would be stunned with an electric charge, once Ryu retracts to the enemy, he then as the chance to perform a free hit combo.

With behemoth bosses like the Statue of Liberty, the Intractor Chain can still attach to the boss making Ryu retract to what ever body the Intractor was attached to. Obviously Ryu cannot grab on and will eventually fall, thus Ryu can still perform some damages while falling in mid air.

Extension is limited

As you can see from this example, any side of the hook can be gripped, Ryu would just thrust the weapon like a stabbing gesture while grabbing hold of a side and the other side would extract and hook on to the enemy. Once attached to an enemy it would instantly retract the whole body of the weapon back together dragging Ryu along with it. 

Ryu holding the Intractor Blade, both either end blade hooks can be thrust to attach to an enemy

Designing this and using the chain seems too standard for pulling the whole body. Muramasa can upgrade it to a level 2 stage and the chain will transform to a beam. Beam of Light contains vast energy that cannot separate both ends of the hooks, thus giving more reason why both with retract together once split apart. 

UPDATE
Here is an example of how the Intractor Blade works in this gif animation

From the gif:
1. Ryu runs towards a ninja
2. Ryu takes out the Intractor Blade
3. Ryu thrust the Intractor Blade to extend it's chain, ninja was unaware of the extending chain
4. Grapple hits ninja and stuns him for a few seconds
5. Immediately the rest of the Intractor Blade retracts back to the grapple taking Ryu along with it.
6. Ryu gets a chance to hit the enemy

The MAJOR important thing about this Intractor Blade is when Ryu retracts next to the enemy, it happens so fast and it's meant to happen very fast. To change the pace of Ninja Gaiden to fast pace. It's another way of playing strategic.

Enemies can also block the Intractor (duh)

Here is the Intractor Blade used on enemy flying in the air. Like I said before enemies hit by the Intractor will get stunted for a couple of second and allows Ryu to attack freely.

Thanks to Ryochan and Umbrae for the sprites.

As you can see from the image above, it shows the weapon as a device can attach to the enemy, once hit directly, it drags Ryu closer to the enemy in an instant. If enemy does get hit by the device, the enemy will be stunned as the device will generate an electricity. Once Ryu gets close to the enemy, he gets the chance to hit.

The method works similar to the windmill shuriken stuns. The projectile device works like a measuring tape, however instead of the tape just pulling back in, it drags you along to the set tape.

Mechanic again is exactly like Devil May Cry 4's Devil Bringer, however instead of you grabbing an enemy and bringing them towards you, you transverse towards the enemy instead.

Devil Bringer grabs and drags enemies towards you

The device will certainly be amazing when used at enemy flying or jumping in the air, Ryu will retract to them in mid air and perform air attacks.