Phillips Curve central, interest, decrease, following, employment

ShooterMcCFA

Cant make head or tail of the following sentence in Schweser on page 173

"When a central bank unexpectedly decreases the rate of money supply growth to reduce inflation, the initial effect is to decrease aggregate supply as real wages rise resulting in a short run decrease in both GDP and employment. In this case, actual inflation is less than anticipated inflation and unemployment increases as a result"

My thinking:

When money supply decreases, interest rates rise, and aggregate demand falls. This reduces prices (inflation) and increases unemployment.

Anyway If I were to accept that a change in aggregate supply is the "initial effect", how ther hell is actual inflation less? Prices RISE when aggregate supply falls.

Anybody?