Considering that it was a 2-on-1 pursuit, did the second pursuing unit that had to move so far even have the ability to pursue? In most of those types of pursuits I've seen, the second unit has no line of sight (i.e. the first one takes up all the available frontage, esp. after wrap arounds), and has to find another combat or reposition. In other words, it doesn't sound like that situation is possible in the first place. But, there is no limit for pursuit distance.