Feel sure the police will find a charge somewhere - if he survives - eg endangering the public, public nuisance, etc. Suspect there will be at least a half dozen laws that can be used.
If the council wants to get picky there are likely bylaws against starting fires in a public space, and pollution ie deliberately pouring petrol on the road/footpath.
General just a bad idea all round. There are better ways to get attention without traumatising bystanders.