When Newton sits in the “cat window” and someone he knows comes up, he gets very upset he can’t be with them. He paws at the window and meows.
He has a bit of separation anxiety. But it does make for some cute photos.
What happens after Pierre hides behind the curtain? He usually pounces on Newton and they fight each other for a while (all in good fun) then chase each other around the house.
Pierre started this when Newton was a cute little 2 pound kitten and felt very superior, never expecting him to grow up to be bigger than Pierre. They are good buddies and seem to enjoy each other during play time.