Don’t quite know what the point is. That video showed the mask clearly often stopping 90+% of the aerosol and forcing it out the sides. That will clearly reduce distance forward for exhale and inhale will be through the mask, smaller molecules that can get through the mask aperatures.
So . . . I don’t get the point. The masks on that guy obviously worked. Very little went through the mask. It was all out the sides.
To me this seems like deja-vu Owen. So what about those standing next to him. The masks with exhalation valves actually increase the velocity of the exhaled microscopic particulate and aerosols. The other masks also collect viral particulate and aerosols that have been coughed up and then they are released every time a sick person takes a breath.
They did not work. The aerosol went in different directions and hung in the air. The point being is that masks do not work in containing aerosol which is the medium that Wuhan uses to get around. The slightest of breezes from an air conditioner, fan or even a door closing or someone just walking by is enough to spread it. Masks will prevent droplets from shooting at someone but so will someone sneezing into their elbow or turning their head.