[RolandF]

Thanks a lot for the input, guys.

So we can exclude a grenade thrower, can´t we?

So we can agree the tail tube was spraying petroleum derivates. But it is uncertain if they were ignited.

By the way, through the hole in the tail cone the tube is almost visible reaching to the last segment of the fuselage. This would point to some kind of security measure and thus to the "hot" explanation.

Regards

Roland