I see the rear portion burning and tipped downward. Superheated gases rising from the rear portion were caught under the canopy of the unburned portion turning it into a chimney. Add sparks and embers to that stream of quickly rising gas and you get a flame thrower. With no where else to go, it weakens the fabric and bursts through the nose in what looks like a separate fire.
The unburned skin between the nose and the upward terminus of the rear fire is smoking because of a stream of heat and flame rushing under it.