I wouldn't worry about the letters of a student. You should see some of the pupillage applications we get.
Were there fences blown down all over the place by this storm?
OK. But were other offences and roofs and similar things affected?
In that case you are not liable at all. This was an act of God.
It would be different if you had neglected to repair or maintain the fence and that were a contributory factor.
You are not responsible for storm damage.
I'm not sure why they say that you are ? Are they alleging some form of negligence? If so, what ?