sure no problem! 🙂
So, at 2:00 the blue bones you can see are used to animate particles/bubbles the character perform on one of his skill (see at 3:10 in the showreel). Nothing really particular about those meshes, no weight on it, it's just basic images attached.
The reason they are displayed like that it's because they are attached to an other bone which is used as a pivot on the ring...
still no path with bezier handle in spine ( Hope the coders will prioritize this feature?! 😉 ), so i had to find a way to create curve trajectory just with rotations and translations.
About the warrior staff, i've used bones as meshes controlers, see below:
Hope that brings answers to your questions ?🙂