If evidence of an incipient rise in inflation were to appear, decisive action would provide a counterweight to minimize the building of a temporary inflationary aberration into inflation expectations, which could be disruptive. And this is why caution and vigilance go hand in hand under these circumstances of increased uncertainty.
Also with regard to the spread between the targeted interest rate and the floor interest rate, an excessively narrow spread will hamper free interest rate formation and impair the functioning of the markets.