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ChainBreaker
I may well be wrong here, but the difference in our arguments seem to be the difference between me thinking in terms of the fluid mechanics between two people as opposed to how you might be considering how to best prevent infection for one particular individual.
If someone in front of me exhales through a soiled DIY mask that's not great but surely the fabric still blocks a significant percentage of their germs? Of course, it would be better if they wore a clean DIY mask, but surely the amount of germs in the air is still less than someone breathing entirely freely.