From the driver of the tractor:
"Very blessed to walk away without a band aid or any injury other than a little sore in right knee from hitting the back of the truck. The front tires getting off ground was pretty normal that's why I didn't stop until I realized I was too late to push the clutch down. My weight was going backwards so I couldn't put weight on clutch. If you watch the very end, you will see the log chained to tire kept rolling and hit me in back and pushed me towards the back of the truck. Nope, it's not sore or anything on my back. I'm very lucky."
Here's the aftermath of the flip: