Launch your big onto the first floating platform. This stage is pretty easy to obtain the mastery.
Power Activation Point
Activate your power as you are about to land on the platform. You will bounce off it and crash into the other platform on the right.
First Shot Result
All the birds die from falling pieces and platforms. You will end up destroying the blue crystals at the upper right platform. This shot will then guarantee you the full three star mastery ranking.