omg! im sorry to see they fought and viciously as well!!
I would take your torn ear bunny to the vet and see if the ear can get stitched up and also to get it properly cleaned up before an infection occurs.
It may be okay to have a torn ear bunny, but as the ears are so integral to a rabbit, it should be checked out by a vet. Also if it remains torn, but has healed, your bunny may catch it on something like a cage bar later on in life and then does a quick turn possibly and can rip the ear further.
Are you bunnies normally spearated and don't get along well? Or are they friends and this is a surprise fight out of the blue?