The whole balloon lady thing is just weird because the 5K is not timed and they never have them in that race. My mom was the last finisher once (at MK) and was on the course for about two and a half hours. Yes, they shortened the course and cut off characters then, but not until much later in the race. There were only a few dozen people impacted.
You'd think of they were suddenly going to enforce a shorter time limit on an untimed race, they'd have communicated it better. I'm not there, but everyone impacted seemed very surprised.