I think Myth Busters TV show did an episode on whether one could "whip" a firearm fast enough to actually curve the projectile. Lots of tests, short answer, NO. The bullet leaves the barrel so fast that no one can influence it to not go straight by jerking the gun as it is fired.
Mounted Patrol Sgt ends an active shooter in austin by firing a single round 312 feet at night, on horseback, while holding the reigns of two horses. Next level.