I agree with all the above and make sure the Runner who isn't allowed with the flock is able to have food and water while you decide what to do.
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Everything I've researched states you need at least 2 females for every male or the will be infighting. I've not got 1st hand experience as my ducklings are only 3 1/2 weeks old but I've been researching and studying for almost a year before getting my first ducks.
Hey everyone!! I didn't get any notices that I had any replies so I thought no one wrote me back until I just logged in today. Thank you all so much for your advice and your time. Apparently they seemed to have worked it out and are now roaming the yard once again in a pack
For sure separate the one that is suffering from abuse from the others and give it time to heal. Maybe go with separating in 2's just make sure who you put in with the hurt one isn't being aggressive towards it. Also post some pics of your ducks full length body so we can see what you have drake to female. Drakes will get a curled tail feather at base of tail and have a raspy voice where girls are loud when they quack