Fire scene gone wrong in a film.

Almost looked like the spreading along the ground was deliberate, the vapor from gasoline typically rises. But whatever happened, definitely a place for professional effects people and lots more safety people. Costs money, but medical and legal bills cost a lot more.
 
.... perhaps the petrol vapour crept along the ground, looks nasty.

Yes, that's exactly what happened. Gas vapor is heavier than air. It is gas vapor that burns, not the liquid. It is flammable in concentrations as low a 1.6%. The vapors will flow downhill and concentrate in low lying areas.
 
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