Originally Posted by
Hiro11
No offense, but you really can't figure this out? Look at the last picture you posted. Your chain has been "sucked" between the chainring (big gears on the front, the ones the pedals are attached to) and the frame of the bike. Just pull the chain out of there and you'll be good to go. This should take about 1.8975 seconds. Also, put some lube on that damned chain.
"Chain Suck" is usually at the bottom of the chainrings.
That last photo seems to show what happens when backpedaling.
Thus, the issue is something that is happening at the rear of the bike (and perhaps the user's description of the symptoms).