Quoted from beelzeboob:I'm absolutely convinced that in order to kill the dragon, you're going to have one shot like with the TOTO shot in WOZ. You'll fire the windlance with the fire button, it'll shoot the ball up to the upper right flipper, and you'll have one shot at the hole behind the targets and beneath Smaug. BLAMMO!!!
Unfortunately, we have to wait for the DVD to come out for WB to release the footage from the third film of Smaug getting aced. Wonder what they'll put there instead in the meantime...
The way it's currently set up, that is the only way I see it happening also. I would assume you would hold the fire button until you built up just the right amount of power to launch the ball to the upper right flipper.... assuming the trajectory from the fixed guide will allow this (didn't see this in the videos but the power may have been set low...)