The exhaust particles and heat haze effect produced by the jet exhaust nozzles of the Y-32 does not follow the nozzles when they are thrust vectored downward for VTOL flight.
The effects continues to be produced horizontally, even though the nozzles are pointing vertically downwards.
Both exhaust particles and heat haze effect should follow the airflow out of the nozzle at both horizontal and vertical orientations.
Realistically there should still be some horizontal blowpass? when nozzles are vertical, but majority should follow the nozzle.