Board Thread:Manga/@comment-5774380-20160908231942/@comment-27441457-20161004213026

CommonSwift wrote: Heir of Revan wrote: Late question: how the hell can you work an omnidirectional mobility gear with one hand? I don't think you can, didn't Levi want to leave Erwin back to Rose because he was praticaly titan food without an arm?

That's true, but vertical maneuvering equipment can be used with one arm to some extent. Erwin managed to grapple to the top of Wall Maria near the beginning of the battle, and later grappled down to the ground below to regroup with Levi and the recruits.

My guess is that each handle controls one grapple each, probably left to left and right to right. That makes the most sense to me.