Action 1. They may not be together.
Characters: Romeo in a mask, Juliet, an asymptomatic carrier of the virus, without a mask, both indoors.
After a short conversation, Juliet sneezed on Romeo. (The probability that Romeo will get sick is approximately 60-70%.)
Action 2. They should be together.
Characters: The same, both wearing masks, indoors.
After a short conversation, Juliet sneezed on Romeo. (The chance that Romeo will get sick is less than 1%.)
The meaning here is that we wear a mask not so as not to get sick, but so as not to infect others.
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