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The paper in question, by the way, did not primarily set out to find out how far was the "safe zone", as telegraphed by their describing this experiment as assessing the dispersal of B prodigiosus from the *uncovered* mouth.

They were doing this to get a baseline, to evaluate the efficacy of masks.

Quote:

Abstract

The use of face masks to prevent infection is now generally accepted, but the type of face masks worn remains variable; experimented with commonly used mask material to prove their efficacy or lack of efficacy in preventing infection; experiments show a 10-foot danger zone for speaking; experiments demonstrate the effectiveness of three layer buttercloth masks.

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