I am not an expert as I only have a simple set up but from what I can gather its just another one of Jaro's and presumably other airbrush professionals' techniques. I think it allows him to use a really low air pressure and have all of that air pushing paint through without gathering around the nozzle and potentially spitting drops onto fine work. It's obviously important to not stab the needle whilst doing this as it could bend further, easier; in fact I have seen Jaro bend it and just straighten it and keep going. If you have a good airbrush maybe buy a cheapo one and practice with it, or get some cheap needles because you will probably bend a couple. It just happens. I'm sure someone else can elaborate on this
It's not the nozzle he removes, but the nozzle protector.
Removing the nozzle cap indeeds makes it possible to blow paint on your moddel without also blowing dried up paint that was stuck to the nozzle protector.
It does make it more likely to bend the needle, so be careful :).
wow so many mistakes... nozzle protector = needle cap
Hope that was it, wrote it a bit too fast ;)
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