Again, you're talking about bullets which still have a Vocos(theta) value, which makes things different depending on said value. When the statement was made that a falling bullet can't kill you, this is in reference to a falling bullet, i.e. one that has a 0 or negligible (arbitrarily small) value for Vocos(theta), and it's velocity/acceleration is completely dependent on the value of sqrt gt/2 and Vosin(theta). If I was better at calculus I'd be able to find out at what range a bullet become ineffective to kill someone, but uhhhh...I'm not. Math sucks.