This is a follow up of Infinite Boot Boost glitch (see previous page)

You can use the grappendix as a propulsion and air-braking (parachute) gimmick with this glitch. If you are wondering how it works, for some reason whenever you throw the weapon you are carrying the game spawns a invisible copy of it.

Why? I don't know. What do i know is you can attach the grappendix to it and grab the real one back, essentially giving you infinite tranq-boost, it's uses are very limited since it's slower than tranq-boosting and using it as a parachute is even harder but possible, a vertical velocity display mod would help with it but we currently only got a horizontal velocity display mod if im not mistaken, i hope someone finds a use to this for now this is kinda like the hypersonic barrel glitch, cool but not many applications.