Could have lost a belt, or the engine could have died. Don’t know why they don’t teach people how to handle these things in driver’s ed...and people should really consider whether or not they are strong enough to handle a large vehicle (sans power assist) before driving it.
Aztlan Mexican are protected and above the law in SF, and regularly kill and maim the taxpayers while getting housing subsidies and other welfare from SF.
If you are an ordinary citizen, don't fail to sort your trash or be in possession of a plastic bag.