wolfwings - 01:40 pm - That's easy to explain.
The roof was what knocked the front bumper and most of the engine block of a mid-70's Chevy Suburban completely out of it's chassis. That it held up as well as it did is amazing to me. :-) Hell, the dome-light still worked, so the tunnel the wiring goes through was still intact.
But yeah, when the roof caved 'inwards' that's the same to the door as if they opened 'outwards' so they took, effectively, zero impact from this collision. Hell, as evidenced if you look closely, the windows are rolled down in the later pictures, but very clearly rolled up in the first ones, and I only took about 5 minutes taking all those photos.