Launch your first bird as close to the edge as possible into the sphere. By having a wider angle of entrance, one of your bird can fly past the ice towers to kill the last pig.
Power Activation Point
Tap for your splitting power somewhere before you are near the first ice tower.
First Shot Result
One of the split bird will fly high, past the second tower and reach the pig at the end of the path. Killing the pig and leaving you with the mastery.