My propane lantern uses a tiny stream of fuel, so oxygen exhaustion
wouldn'tbe a problem at all, unless the vanis hermetically sealed and
less than 3 cubic feet in volume. Knocking it over would be bad, since
the mantle is fragile, but I don't think it is much of a fire hazard.
You'd have to pick up the lantern, perhaps turn it off, possibly replace
the damaged mantle and relight it.
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