Absolutely fantastic

Lady Giga was absolutely fantastic today! I have to trust her more. I rode her with my cavesson. We rode first in the paddock and afterwards I rode out into the forest together with Josefine and her horse Merlin. It's so wonderful when I finally see some good progress. Giga was a completely different horse today. Obedient and calm. + When I stood and brushed her suddenly a giant barn door fell  down over her. It hit her right on the neck and head. The halter took the worst impact and the iron parts burst into pieces. Both me and another woman got a huge shock, but Giga just stood still. That's what I call a cold-blooded horse!
I wonder how the door fell off the wall. It was pretty weird?