The landing attitude looks a little out of shape at the point the photo was taken, but I am not willing to criticise based on the evidence of a thousandth of a second.
Clearly however the right engine has been secured and feathered and we can see into the cockpit so they can probably see out.
ATR pilots will know that the final item of the Single Engine Operation checklist is a Note, not very prominently written, warning that the operative Power Lever should remain in or above Flight Idle until the Nose Wheel is on the ground. We all know the Note is there but if the checklist is performed rapidly and perhaps late during an approach it may be overlooked or it's significance not emphasised.
Selection of Ground Idle or Reverse Pitch without the nosewheel grounded potentially produces a big swing into the live (in this case left) engine as the prop enters Low Pitch range, with reduced steering effect available to counteract until the nosewheel contacts the runway by which time it may be too late and you're already heading for the long grass where your best/only option is to continue straight ahead.
Whatever ultimately is shown to have happened, I echo the most important sentiments which are that all are thankfully safe and the plane will doubtless fly again.