glad to hear they are doing well. I think you need to build a more secure coop for your remaining hens, because that predator is coming back and behind him will be another one. Make it so you can lock them up at night, but they will need to be in something with sides and a door. see if you have some scrap material around your yard , at least you will need to put up the 1/4 inch chicken wire or the hardware cloth on all sides and the top to creat a cover.Good luck