The who died is the owner of the car. he was under the car, fixing it, when unexpectedly the car moved thus he was ran over by his own vehicle. Paul is outside the topic i guess. he was just added in the sentence to make the sentence more confusing and tricky.
I believe the riddle says "There are a few trees in a garden. On one of them, a pear tree, there are pears (quite logical). But after a strong wind blew, there were neither pears on the tree nor on the ground. How come?"
There were no "pairs" mentioned. My answer is...
Statement : There are few trees in the garden. One of them a pear tree ,there are pears (quite logical). - The statement "there are pears (quite logical)" ,means that there are more than 1 pear tree in the garden.
Statement: "But after a strong wind blew, there were neither pears on the tree nor on the ground.". - the "pear" being referred in the statement now refers to the pear fruit that the pear trees bear. remember the statement says "neither pears ON THE TREE NOR ON THE GROUND".
Statement. How Come? I believe "Having fallen on the ground" , "being blown by the wind" are far too shallow answers to the riddle.
ANSWER: There were only trees but the trees do not have fruits that time. It may not be the season of pear thus, no PEAR FRUITS fell. There were neither pears on the tree nor on the ground because after all, the trees are not bearing fruit."
And that I believe is the trick to the question and the most probable answer