Eyewitness reports suggest the aircraft was significantly displaced from the centreline at a late stage of the approach, and that some fairly aggressive manoevring was employed to get back on the centreline. It appears to have had a very high AoA at the time of touchdown. At least one engine was running,the power setting is uncertain though a PPL eyewitness commented that the noise seemed unusually loud. As he also commented that the aircraft seemed much lower than normal (which is consistent with the short landing), the extra noise may be related to the lower than normal altitude. The aircraft's configuration at touchdown appears normal, and the weather, though a little gusty, seems unlikely to have been a major factor.
Whatever the cause, at least everyone got out safely.