I did it on fallen.
Sometimes people refuse to cap flags (which does not make sense to not cap the base flag). Some of the team rushed A (but we were already there), we left 2 people to cap B and none of their team capped C (I think a couple were waiting for us to come).
We figured that was their strategy and we clipped them and capped C and we have 2 at each flag. Once we had air support they left and then it was a revolving door of players until it was 200-0 (it was also HC Dom)