Originally Posted by dutret
if the dropped chain gets caught on something and locks up the rear wheel it seems pretty possible to me. Think of it as violent rotafixing.
That doesn't make any sense.
The most force you'll be able to apply is determined by the friction of the tire, it'll be the same as a hard skid. It doesn't matter if the chain stops moving because it's caught on something, or if it stops moving because the cranks aren't moving (skidding).