I have severe allergies and on public transport I wear N95 mask. It effectively filters out everything that might be a problem for me, and as a bonus have avoided getting sick even when everyone around me seems to be catching things. If everyone did this we could eliminate airborne viruses and many other conditions, but I’m not holding out hope for that.

Calmly, while holding up the hatchet, say this:

“If you are still standing there in ten seconds, I will kill you.”

If they say or do anything other than run away, start counting down:

“Nine… Eight…”

We are truly doomed as a species