During an appearance, the presenter may cancel the current scene, if she has totally failed, and is completely out of control. The bar must already be quite high, and under no circumstances shall he break off a regularly occurring, "not so good" scene. Even the pros cancel - albeit rarely - a running scene, so that's not a disaster if it does not just happen every waking hour! It is important that the moderator skillfully comments on the situation and does not leak "how horrible!" to the audience. Sometimes a declaration by the moderator results in a temporal jump back in history with different, deviating courses of action in the sense of new votes.