Originally Posted by sydney
Well, that's a more likely cause than derailer adjustment being off. If it shifts ok the adjustment also ok and in no need of fiddling.
I think you were right, especially if the chain is in a crossed gear, it can jump cogs when back pedaling. Probablty the deraileur could use a little adjustment. Every one is right. Don't back pedal, keep dr adjusted etc. Good job on keeping it civil after getting dissed like that!