I have several Polish/cross hens and every single one is a total spazz. They run away screaming if you even look like you're thinking about getting near them. One pure Polish is quite skittish but not as bad as the crossed Polish. And they fly really high. We had to put netting over the 6 foot high run to keep one in. We like to keep them penned until afternoon so they get their egg laying done before they free range.
One had taken to flying up onto the coop roof and from there up into a huge Cedar tree. Refused to come into the coop at night. We trapped her and clipped her wings, but that only slowed her down for about a week. She's back at it again.
I was told after to only clip one wing so it would throw off her balance.
I'll never get anymore Polish hens. They're too spazzy.