To me looks like pilot error and possibly a combo of wind-shear as Multiglisse said above. Problem is landing at what looks like most likely 700 feet per minute with all the weight taken on that right mount. I bet if they were able to land in on both main mounts it would have been able to absorb that. You've probably been in a plane landing in a x-wind at the pilot plants it pretty hard on the runway vice a long flare. If you do a long flare the x-wind will push you sideways, hence more of planting it on the runway.
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