Because inflation normally responds slowly to such shocks, inflation targeters could respond in any of three ways. Strict inflation targeters, sometimes snidely called inflation nutters, might sit idly by and let the recession happen. Or, if inflation fell below target ranges, some central banks might take steps to boost inflation by expansionary monetary policy.
They would clearly do this if deflation threatened, but they might do it even with low positive rates of inflation below target ranges. The third possible response involves flexible and forward-looking inflation targeting as is actually practiced in most countries.