Given his height its not much of a matter of how far the bullet needs to travel when it can also fall 32 floors. So all he has to do is shoot straight over the concert parallel to the ground and he will likely hit people as the bullet falls. If he wants to make sure he hits people, he just has to start by aiming at the furthest person and walk it up from there. He is sure to hit someone without worrying too much about the calculation of vectors and gravity.
Be curious to see if he had a `Slidefire’ on the AR. His target was a huge group of people and accuracy wasn’t that important. Doesn’t sound like he was really aiming, might have just laid down a beaten path and people were walking right into it.
Have you ever seen a drop table for any caliber of modern ammunition? Have you ever taken a course in physics? Have you ever hunted, or even fired a rifle of any caliber at a target?
Your post is pure BS.