Before reading any of the replies to the scenario my response was, "Absolutely." Having read everything upto this point I think some people's observance of "Fair chase" would preclude them from taking a shot. I say 'observance' because this principle means different things to different people. Some people would never shoot a turkey in a roost or a duck on the water. I don't think there is necessarily a right or wrong answer outside of legality.I think the question here is why wouldn’t you shoot it? I’d like to hear some of those answers.
In the given example I would stand by my original instinct to take the bull. I hunt primarily for meat and the horn is a bonus. I'd use every bit of the animal just as if I had harvested it without the storm. I would also note GPS coordinates and inform authorities so any other usable meat could be salvaged.