Piggybacking here as I have not seen this answered elsewhere.
If the player holding Geis passes and then in the same round, later wants to cancel a green action card by another player, can the player play Geis or by passing are they not allowed to play the card?
Just to be very clear, you can pass and then play actions later. Passing doesn't mean you're out of the round. The only effect of passing is that the round is over when everyone passes in a row. So you might pass, expecting to play more cards later, but then everyone else passes, and you don't get a chance.