Ever seen a dump and burn from an F111?
Dump pipe is down the back between the tail pipes.
Start dumping and add a touch of afterburn and it all lights up.
Most spectacular.
Flame front never quite catches up with aircraft.
The afterburner fuel pump/s pump out the fuel at a very high rate cause you want to be rid of a lot of weight in a big hurry if you lose an engine after take off when heavily loaded.