Yu's side effect at least start to subside after the due date for the Sentencing. They might even think that they got away with it!

That is until the event. Whether the Chosen has turned into a monster or not, they will feel compelled to defend the Black Beast. How intensely they do it is up to you, be it something they could be persuaded against doing, or put up a fight to the death to defend it.

These side-effects will last until the end of the event.