Straight, you've got the wrong pic and caption. Look at the pic on pg. 53 where he says about shooting low.....it's right above the advertisment for the "fastest arrow on the planet"!

My bow shoots about 260fps. The arrow will make 20 yds in .231sec. Lets add say 60fps. The arrow covers the same distance in .188 sec. You say that reaction time is .05 sec? Speed is insignifigant...

BobCo got it right. There is more than just gravity acting here. When a deer drops it is rarely straight down. They push off to the side away from the sound and drop accordingly. Muscles actin here..

For that matter, if shot from a stand, your arrow is also accelerating due to gravity to some extent. This should negate the force of gravity of the drop all together. The theory is flawed....