Now this is complete nonsense - as anyone who has actually read THE HOBBIT could tell you Bard the Bowman would have shot the wind lance, snatched up his bow to correct the course of that black arrow and performed a gold-medal worthy dive off that tower into the waters of the Long Lake (hitting the water at JUST the right time to be silhouetted by the huge cloud of steam sent up by Smaug's remains without being boiled alive by them) in half the time!
Then go on to somehow resurrect a long-vanished Kingdom AND stand up for Democracy SIMULTANEOUSLY.
That would have been perfect! Although I must admit that I had some weird hopes of seeing Bard shoot that black arrow from a regular bow! But still it would have been more intense if it was just a regular bow and little Black Arrow against that HUGE Dragon.