This happened to me last year in the Raptor line which was extremely long, I don't know if we were made to get out of line, or everyone was just agreeing that it was time to leave. Everone that was in line turned around like a wave and everybody walked out, so I just figured they closed it for the rest of the night. But I nevertheless agree that it goes case-by-case.
Life has it's ups and downs, might as well make it on a coaster!