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Flow mechanics. Expanding gases, like fluids, always follow the path of least resistance, and so do any objects being driven ahead of those expanding gases.

IOW, the trunk area would have gone to the rear, the backseat would have tended to go up, through the back window.
Whatever the object was, it suddenly appears out of nowhere, out of the middle of raised hood, headed almost straight at the camera. Slowed down, frame by frame, it also displays some funny looking edge artifacts, like something inserted into the frame.

Also, the object appeared to be hollow. Low density per volume, which means low energy retention. Would have surrendered most of it's energy on the first impact, not bouncing back like a solid billiard ball.

(Funny story, in durka-durkastan, if they were standing up straight, the heads of suicide bombers tended to be found right near the remains of their body after they'd clacked themselves off, because it would ride the shock wave straight up, like a hairy soccer ball (but trailing fluids), hit "max ordinate", and then come straight back down again. Thunk.)

The beauty of a response like yours is that it saves me time. It means that I can safely ignore anything you have to say in the future, on any subject at all, without any risk of missing anything even remotely intelligent, cogent, or insightful.

Thank you.

Bye bye, porkchop.

Looks like a burst propane tank, that's an LPG vehicle.