MD600.....it takes a bit to fire up the NightSun....but not a lot of time to swing the IR Filter away if the Night Sun is already Operational.
Had NVG's been in use....it would be somewhat normal to have the Night Sun in operation but with the IR Lens in place so that only IR Illum is produced.
I am sure the Police have a SOP for use of the Night Sun....and I would bet they do not fire it up unless they are spotting with visible light as a result of a Tasking.
Some of the Police Pilots might respond to that.
If I was having to contend with a sudden demanding flight emergency....the last thing I would be doing is fiddling with the Night Sun. If the Observer had the time....presence of mind....and was not occupied with other business....perhaps the Observer could have gotten the Night Sun into operation.