Launch your pig at the second layer from the top of the first building.
Power Activation Point
Activate your lightning power while in mid air. You want the lightning strike not to be blocked by buildings. So you will have to activate it pretty early.
First Shot Result
The lightning strikes knock down the metal balls which trigger the bombs. The bombs tip over the floating platforms and kill all the birds. You will then win the three star mastery after all the birds are killed with just single shot.