I think it left the road at a high rate of speed. Went up into the air, hit the door and side wall, knocking them off to the side. Landed on the Nova. I know it sounds fishy, but at speed, weird stuff happens.
I used to catch up with a buddy of mine that drove a city bus. We would chat during his break at the end of his route. There was a long road, alongside a park, that people flew down. One day some rubberhead ran that road at speed, lost control, and landed up on the sidewalk against a two foot tall retaining wall. There were two big trees along the curb. No one could figure how the hell he got there without smashing into the trees.