That's very scary....you need to be very careful for yourself around them when they're fighting...and you definitely need someone skilled to assess the situation before you let them be around each other again.
My parents had two Basenjis that didn't get along (Mom rescued one to keep her existing one company after another one died). They never got along....but Mom really liked the new one, so she thought she could keep them separated. Their house had an enclosed wrap-around porch with French doors and Mom's plan was to make sure that one was on the porch or in the house when the other was outdoors, and one in each of those areas when they were both in the house. Well....Mom let one out, forgetting that the other one was already outdoors. She tried to kick them apart and got her ankle slashed to the bone....she never did know which one tore into her in the heat of the fight. [Something I never forgave my Mom for: she had Dad take the original Basenji to the vet to have her put down instead of giving the "intruder" back to the person she got her from. Mom said she'd been grieving too much for her mother...this is the dog we're talking about here...and her personality changed. Whatever. Needless to say, Dad did what Mom wanted ("I can't go back home with this dog.") but the vet wouldn't put her down...would find her a home. Thank goodness. There was nothing wrong with Joy. (I found out a day or two after this happened. I was in an apartment, I couldn't consider trying to see if she still needed a home. Dad said he thought the vet might actually be keeping her.) Mom had surgery and had to keep that ankle elevated for months afterwards.
Whew...hadn't thought about that in a long while.
Anyway...be very careful. Very. Careful.