As you can see in the video, Stoner went off at very high speed, and his bike was sliding right beside him the whole time. Thankfully, he didn't face any life-threatening injuries after the incident, but motorcycle riding isn't going to be easy for quite a while. Stoner briefly explained on Twitter that the crash happened when the cycle's throttle stuck open. The end result was a rider healing from some fractures with his arm in a sling and his leg in a cast.
Still, after seeing the speed of this accident on video, it's clear that Stoner's injuries could have been much worse. Hopefully, he recovers well and is able to get back to doing what he loves again soon.