Thank you for posting a video because honestly with it like this there is no way they intended for Spiritism PvP to be a thing. You're telling me they couldn't get 2 people together in their internal test team to try banishing each other? Banishing only works on AFK players.
The only thing I think they can do to make it work for in its current state is to slow down movement so it's possible to track someone moving. If they make the hitbox bigger it's going to make it harder to fight spirits because you need to be able to target the exact orb you want and they already have a small area. Plus you don't want to create the problem of having a player hitbox being targeted over an orb from a spirit when you're playing in a group. Making it take less time would be them buffing how much kau you drain per second but then that's going to make it too easy against players with low kau and probably still not be possible for someone with 200+ kau.
Perhaps make it so you can cast all spiritism spells while moving ONLY IN THE ETHERWORLD. This way mental projectile can become the intended way to fight it out. They might have to put some special coding on the portal so you can't have players sandwich themselves between portals meaning an enemy player can't target the player. But then again being able to buff yourself while on the move just extends the fight anyway so we might be at the same problem =/
