Well iam not a good archer shame while i was tring to shoot down dear from back of my horse i adenticaklly shoot my own horse in the head so far so clear that i (pseudo)killed my horse with this and flight pretty hard on the ground so far so Normal as i opened my intentory and swithed to the horse tab of the inventory i found that the picture where heinrich sits on the horse somehow get way bigger to the top of the screeen and exceeded the screen. (Fix itself after a time)
shortly after the kill the whilse funkton do not work(well calling a dead horse is pretty much senseless) but i do not know if it was itended and even then the horse reseurect the first whillste after thet seems the horse to miss calulate where i stand and runs somewhere near to me.
For me the system do try try reference the horse in some way if the horse intance is not to be found the game get confused in many way until a new Horse is been created