"Supposed to" is arbitrary. If the rules of the tournament state that the competitor can continue his run after locking up the game in order to make an attempt at the event's high run prize, then that's the new "supposed to".Stu, while I get your point that the run is supposed to stop when the match ends
At my house, we play almost exclusively cash game straight pool to 100. Part of what we do is that the high run holder for the day gets credit for an extra win at the end of the day, and we allow the shooter to continue past 100 to try to reach this goal. It's a bit of fun and I can't see how it harms the game in the least.