That's a very unfortunate incident, and sometimes even despite our best efforts, these bad things happen- thanks for sharing. I'm sorry you lost your hen. Frostbite has been an issue here too in the north east- the weather swings are wild with rain one day and 20 below the next. The air is so humid venting the coop hasn't helped, and some of the chicken's combs have been nipped by frostbite. I'm in the process of eliminating single combed breeds from my flock (Once I finish some cross breeding projects). In the future, I'll only have chickens with pea combs.