Assigning Blame

He'd made a huge mistake, an error, so he knew, of thought. The road looked fine, smooth bitumen so he proceeded with due care until he was upon it, quel malheur! A boulder from the mountain top had rolled onto the street, during the night. it stood, in all its might and took the force of shiny steel and neoprene without a whimper of complaint. The pages of the triplicate report remarked that he had caused the accident, through negligence, contributory, someone asked? Oh no, it is plain logic my young friend, had he not turned into this street... and the big rock, so out of place, well never mind, here, use this sheet.