Got home, calmed down, got story from N95-masked spouse:
It was a little stuffy lobby that the face-scarf friend was in, so room prob had lot of virus. Exposure brief, few minutes. Spouse had tight #n95.
"Exposure Protocol" goes like this:
Presume exposed person infected. They wear N95 in house. Okay to remove mask in closed isolation room, towel at door base. Furnace has HEPA filter. Monitor for symptoms, test with #COVID / #Flu RAT repeatedly. Call all-clear after several days neg tests.