During your Battle Run you will play against other players who are also playing Team Wars, and will use your Team's War Deck. Battle Run ends when you reach 3 victories or 3 losses, whichever comes first. At this point, you get a score for your performance in the Battle Run, and this score is added to your Team's Score for the current war. If you don't finish your Battle Run, your team will not have any points from you, and you will not get any rewards from the war.