They did it for most of the rounds. On Nord town, we saw them starting to retreat to the graveyard, 20 seconds later. Oh what do you know, the flags spawn in the graveyard and it occured 3 or 4 times. When we were on the lower spawn, it was always in the middle for which they had started to push forward shortly before the flags started and were literally sitting on it as they spawned before we got the chance!