I am having some difficulty getting a mental image of the accident. Probably more the hour, than your explanation.
But since you are having issues with responsibility and liability, as Chicago Al pointed out, talk to an attorney. These types of cases are evaluated and taken on a contingency basis, so you will not have any initial cost to consult with one. So, do yourself a favor, discuss it with an expert (a Personal injury/tort lawyer) and have them explain your situation and legal rights to you. Good luck.
FWIW, IAAL, but not your lawyer, and this is not legal advice.
zac