The bbeg snaps out of it, it was an evil sword all along, the bbeg helps the party kill the confused minions.

The bbeg befriends the party. They go out to the bar after freeing the prince. The prince never stops looking side-eye at the bbeg, but the bbegs has won over the party. The bbeg was under the sword's control the whole time. Bbeg tells all the plans the sword's had made. The barons that were bought off, and the ones blackmailed.

The party goes to the bought off Baron first. Bbeg goes Anikan and gives the Baron the doku treatment before there's any questioning. Bbeg says Baron knew sword was in control, went along with it, tortured bbeg.

Drama ensues.

I once used Remove Curse to end an enemies attunement to a cursed amulet possessing them mid combat.

Yeah, that's the gripe we have with both of them.