If they are broken before the base of the feather, you'll have to wait until they molt out and grow back. But if they are pulled out, they may grow back in a few weeks.
I do agree with that suggestion, though. Take away your meanie and anyone else who may be attacking your Polish. You can wait a week but there is a speculation by scientist that chickens forget something if they don't see it after two weeks, for example, much like how the broody hen is veiwed by her flock if she is away from her flock, brooding on her eggs, for that 3 week period. Same deal.
But now that your Polish are veiwed as the enemy, you'll have to work your way from there. Make sure they have places to escape to if they are being chased down by the other birds. If there is bloodshed, remove the injured fowl. Immediately. One second it can be a minor bleeding scratch, the next it can turn into a wound that is slashed open and life-threatening.