I watched the video of the Extra 260. Looks to me like the landing was intended to be that way with a slow roll to the mains. Most people who think that they may be in trouble during a landing would have powered up and went around but this guy didn't. The sound I heard during the landing just seemed like your normal landing gear hitting the dirt. Granted this was not a very graceful landing but an attempt at something different for the camera. I really didn't hear a crack. This is just my observation of the video.