Most times, people only learn of the cause of their accident, after the accident has occurred. Clearly, if you knew about the hazard before the accident, you would have been able to avoid it. This is true, even with latent, hidden hazards.
However, if even after your accident, you cannot identify what hazard caused it to happen, then logically, we would have no way to hold the property owner or possessor responsible. Being unable to identify what caused your accident to happen is usually fatal to a claim. Lets talk about it, just the same, to make sure.