Originally Posted by
Kimmo
That's what woud have done it; I can't imagine another way the hanger would've been bent in that direction.
If a tight link in the chain refused to flatten and run through the rear derailleur the derailleur can be bent that way and even twisted completely off. Happened to a friends new bike. The dropout plate was pulled out of the chainstay and the bike had to be sent back to the factory (Trek).