Bah! Revenge is only for slowpokes, imbeciles and cowards. You should always face and resolve grievances immediately and not give chance to later have to be ruminating on nonsense and stupidity in your mind for days. Even more so when it comes from injustices. A mind that is always clear, calm, at peace and free of conflicts is what everyone should aim for in order to move forward.
And if for some reason at some point you end up being the loser in the all of the sudden fray, then you simply get up from the ground with a smile and prepare again for the second round until you completely empty your mind and leave it free of conflicts. No one really deserves to go through life carrying with the weight of thoughts of revenge, regrets and remorses on their backs when they easily could have avoided the causes that produce them immediately.