Without knowing the facts of this particular incident but by just viewing the damage it seems that they have landed with the gear doors in fully open position and hydraulics syst 1 operative (gears use syst 1) on. Normally the red ldg handle on the pedestal (alternate extension) would be pulled up to put lgd pressure to return and releasing the doors to not have this kind of damage.just scraped doors on the friction pads. It have happened before and have many times been caused by faulty ldg door sequence valves so the doors fails to close. But since no fact are specified that is just a plausable senario
It will be a nice job for the sheeties
and a coulple of new doors on the shopping list
Regards
1011