I noted among all the pictures (this event or otherwise) that landing on the engines tends to at least partially deploy the engine reverser sleeves.
Seems to me ground contact has occasionally deployed
bucket-type reversers. This caused some extra work in (I think?) the SpanAir or 727/Dallas no-flaps-TO investigations - until grass stains, ingested earth, and/or witness marks demonstrated the reversers were forced open by ground drag, and thus a result, not a cause, of those accidents.