I know its hard to watch and hear. I had the same problem when I introduced my baby, but it was the other way around, baby gets one of the older submissive boys. Poor Chicken eats with his bum to the wall, runs every time he sees Huck coming anywhere near him. It has calmed down a lot and I totally know what your saying. My daughter tries to remind me that it is normal, but Chicken doesn't think its normal, he gets it, he's the low man on the totem pole, but Huck just keeps reminding him!!!
Hang in there, its hard I know, but it will calm down. Huck still purrs and sways but its not as bad as it was.