In the last fight scene
David Mattey, who plays the Super Drone, was wearing a suit of armor and prosthetic appliances on his face and full colored eye contacts, the type that surround the whole front of the eye, greatly restricting your vision. To add to the difficulty the scene was filmed in the rain and at night. Mattey ended up being a better swordsman than his stunt double, who ended up sitting out the scene.
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