Incorrect load procedure?
Looks like this one was too heavy down the back. The nose gear in the clip was very extended. Boeing say they won't tip, but I've seen one very nearly lift the nose wheel clear of the ground when there was too much weight down the back. It was an unload on a bridge. The rear hold was full and pax were coming off front only, so all the weight was on the rear. Not much cargo in the forward hold either.
This was an unload and I'd say this is what happened on this one. The wind would've just helped the process.