I learnt this from someone... I'm not sure who, but whoever you are here is me noting down your credit *waves*.
Focus: Controlling pack speed, positional blocking
Have 8 blockers on track at once, 4 blockers try to get 5 laps in while 4 other blockers try to hold them from getting 5 laps. This can be done by slowing down the packs by blocking or goating (as pack definition rules apply). If the one team can hold back the other team for two minutes they win, if the other team gets 5 laps in, they win.