Two young pullets constantly sparring

[Erin80]

They are 24 weeks old, and they were brooded together...along with a light brahma who no one bothers. The two that that spar endlessly are a salmon faverolle and an Australorp. The salmon is definitely bottom of the pecking order, and the Australorp is initiating the sparring. They run at each other, jump in the air and just spar. Over and over again. There will be peace for a while and then I will hear squawking and they are at it again. No one is getting hurt, but I'm not sure what they're doing? The salmon is already the bottom of the pecking order, so why would my Australorp pick on her? The salmon is extremely skittish and fearful of everything - when she was younger she was beat up badly by one of my older hens (who I have since given away because she was causing a ruckus in the flock), and ever since then she is just scared of the world.
Anyway - just wondering if this behaviour is normal? Or if they need to live separately?

 

[chickens really]

How big is the Coop and Run?..Your sure they are not Cockerels?

 

[aart]

I've had pullets feet fight, but usually at a younger age(3-4months).
..and it's not constant or really adversarial, just play fighting coupled with lots of running around with wings spread..
Wonders about gender too...or maybe the low bird is striving for a higher position...ro have any of them started laying recently, that can set off hormone surge fueled pecking order battles.

 

[Erin80]

They are just at laying age...so maybe. They are definitely 100% female.
Our run is 140 square feet, and the coop is 80 square feet. The sparring actually seems to happen most when they are out free ranging, and not so much in the run at all.

 

[aart]

and ever since then she is just scared of the world.

It could be her timidity that is spurring the other bird to attack her.
@azygous has a good theory and solution about reinstating a birds confidence.

 

[azygous]

As @aart mentioned, as long as the Faverolle is fighting back, things are actually normal. Things turn abnormal when the Faverolle quits standing up for herself and retreats to a secluded spot and maybe even quits eating. Keep an eye out for that development.

There are personality conflicts in Chicken World as there are in human relationships. Your chickens will work it out. If the Australorp refuses to mind her own business and this bullying continues and you notice the Faverolle begin to act withdrawn, you might then step in and administer a little "aversion therapy".

I happen to have an Orpington that finds delight in shoving the more timid hens around. I have fly swatters situated in strategic spots to be handy to grab and give the OP a swat on the butt. Try it. You will probably be satisfied with the result. I usually only need to brandish the swatter and my Orpington runs the opposite way, forgetting her victim.