Which misses the point that on a moving bus with open windows, and there's virus around, all you are doing is flinging it at force into the faces of those at the back, instead of allowing the particles to the floor. Crazy, just crazy.
Although if face masks work, then issue solved, let's close the windows. It's either one or the other, face masks work and we're saved, or they don't so why are we wearing them? Seing as we don't know the answer, then wear them and close the windows to let the virus drop to the floor if that's what it does.