I don't have the game to show anyone, but I found some tech playing locally.
If you use a projectile, or reflect a projectile with Athena/Kula and tag and convert off/into the projectile it let's you tag twice during a combo even though the combo restriction is one tag per combo, but It only works with projectiles.
Example:
Mai Fan > Tag > Fan Hits > Jump in > some long ass bnb with terry > wallbounce > power wave > tag > run up from anywhere with mai and launch > some long ass mai bnb
