I don't reckon a rotor would do this. Looks to me they hit nose down - in fact almost "flopping" onto the ground in a very hard impact. In a down draft the nose would be up, but in the picture the tails is in perfect shape, with heavy damage to the front / wings (look how flat they are but not bent backwards) so I agree with IO that they were nose down with low forward speed, high vertical speed so probe noably stalled before thse went down.
Actually those pictures are pretty shocking. I don't recommend anyone lets their partners see them or they will never get in a light aeroplane again. I am just glad that it would have been quick judging by the damage.