I think the current auto-attack (its the same as the normal avatar) does not match the theme of alt avatar vindicator - also the fact that he carries a glaive but still fires those dorky looking magic bolts is a bit crap
The auto-attack for the alt avatar should be re-done - make it match the colour scheme better/change the sound effect or give it a totally new animation in line with the theme of the rest of the avatar (as you did with witch slayer/pimp slayer)
Agreed it should be something that spins like whatever he has in his Hand + Not many new animations tbh, I was expecting a bit more than that for 560 coins.