Which doesn't make a whole lot of sense to me. For one thing, "catch" isn't defined anywhere in the rules. And unless the quarry is grappled, what is to stop it from bolting and starting the chase over again? For that matter, why would it stop running in the first place? Just because a pursuer is close enough to "catch" a quarry doesn't mean that it has the means to stop it on that round. The pursuer will still need to use an Action to attack or grapple the quarry, which gives the quarry a chance to escape the pursuer once again. So until we see the results of that attempt, the chase really shouldn't end.