Copied from tooltip above:
The case here is when, in a special episode (usually a celebrity special), the klaxon plays in the middle of a run, and the run will not continue (usually due to the next episode). Examples: Anitra Ahtola, https://youtu.be/iFR4VZJ3MUc?t=141, etc. This case does not include unaired unknown continuations (e.g. Barbara Mayhall Hunter) or contestants not returning despite being promised to return (e.g. Zoran Popovich).