I was on a Trident
way back when on a pressurisation check.(On ground of course) We were at max diff checking the first safety valve when by esteemed colleague let go of the wrong switch. This resulted in popped ears a dense white fog
On the ground you have much more humidity than at higher levels which is the origin of the fog but I would be very surprised that following a flame out you can experience a sudden rush of air apart from the one that may come out of your pants...