Thanks.Breathe out gently and stop the flow without closing your mouth
Got it, I think.
So I do exhale & appruptly stop with mouth open and that act closes the glottis. If I keep pushing to exhale (from where, not sure lungs I guess, but maybe akso chest and ir stomach muscles) despite the closed glottis I cannot and the upper airway area sort of has a congested, blockage feeling...
... and in that sense the light cough also now makes sense... the glottis as a studdering valve of sorts while forcefully exhaling = cough...