@drab_lightstick unfortunately, that isn't what the guards translated it as—they translated it as "attempted assassination of the Crown Prince", which is a far bigger deal.
Also, the priest looks very likely to be the one who has an axe to grind against Shuli. It appears to me that if it if the priest is the one in question that he sent the boy to stop the Prince from getting any closer to Shuli. Though, he may also be seeking to destroy Shuli in the process—based upon his stated beliefs that women acting like Shuli are an abomination before the Divine.
Provided that the translation is correct, they may seem to execute him for treason against the crown🤦🤦♂️. It's a common tactic. Shuli likely is gonna go into shock because history is repeating itself.
It may also be the case that the priest was behind Shuli's murder in the original timeline, but we'll have to wait to see what happens.