User blog comment:Trainer488/Hai/@comment-4670087-20111212031755

Build a box hanging from under your Skybridge. Open one block in the bottom, and have it completely enclosed otherwise. You can shoot down through the hole as the Destroyer passes below and you'll kill his Orbs as they spawn as well. If you use the Clockwork Assault Rifle, make sure to bounce your rounds off the wall first, so all three do damage.