At the trial, each group in turn may present testimony for or against the accused. Testimony may also include new accusations or counter-accusations. Periodically, when a body of evidence against someone has been collected, the groups will vote in turn whether or not to convict. A majority vote decides if an accused person is guilty and will be executed. No one knows.
Witch Hunts are unpredictable that way. . .
You will lose 10 points for every member of your group who is convicted of witchcraft. You can gain 10 points for adopting an appropriate member of another team into yours. Other adoptions and alliances are possible. See what you can work out. You can gain 10 points for each person you accuse who is then convicted of witchcraft.