I have had several similar experiences when blown up with wheels eventually rolling back to the buggy, one time a wheel hit it and the buggy collapsed further to the lunar surface. The longest sequence had 4 wheels eventually roll back and then 3 of them rolled away again down the hill.
I guess because the game play is so short I have the time to watch this stuff!
edit- another time I got blown up I landed upside down on a rock and eventually a alien blew up the rock from under me and the buggy fell back to the lunar surface in a puff of dust.
Fantastic game dynamics.