What could cause sudden localized atmospheric pressure change?
Picture a band of happy campers, literal campers, sitting around some fires.
Suddenly they feel their inner-ear "filling up" and after mere instants the ears begin popping, as if they were inside a tunnel, some of them get nosebleeds, some lose balance and fall down if they are standing or back if they are sitting, all feel pain and nausea.
Fairly close by are more of the group, sitting around their own fires, but they feel perfectly normal. They see those suffering and rush to help, and as they approach them they too fall victim to the bizarre circumstances.
What could cause such a sharp, localized event?
The skies are perfectly clear, the conditions are artificially created.
This post was sourced from https://worldbuilding.stackexchange.com/q/94089. It is licensed under CC BY-SA 3.0.
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