User blog comment:Anon421/Small Hints About New Weapons in Chapter 7 Part 2(?)/@comment-31479589-20190715074133/@comment-31479589-20190716040951

Don't forget that Chapter 7 weapons are unique in the sense that they have cool gimmicks that make them function almost very different from what they're supposed to be.

Flail & Shield: The shield is foldable, and can be used offensively. The flail can be stretched, giving it the same range as Chain Knife/Kusarigama

Whip Katars: Anything but Katars. In a nutshell, they're hand-worn Composite Sword with Scorpion style.

What I'm implying is, Glaive-Knives could very well not be your standard glaive. They might be a pair of long knives that can be conjointed with each others to be turned to a glaive. The weapons in Jet's avatar could be a variant of Glaive-Knives, and it's probably how the weapon will looks like when in knives "form".