I'm integrating an 11 week old pullet into my tiny flock within a run. No free range until fall. I have 2 birds and I'm adding this one. Right now there's a temporary fence separating the old from the new. Today I opened the fence to allow them to mingle a little bit. My #1 hen sort of ignored the newbie teenager, since she's top dog I expected more pecking. My #2 pullet really surprised me and seemingly "went for the jugular". There wasn't any blood, but she really grabbed hold of the youngster's neck!! I intervened and smacked #2 upside the head 3 or 4 times while the newbie ran back to safety. She's always been such a total sweetheart, I was really shocked! It worries me that she's so violent toward this youngster especially when it's just the opposite of her usual behavior. What do you think??? Any suggestions on how to proceed? Thanks!