Silens Venator,

That depends on the way one interprets the information.

If we were to have the arrow parallel to the ground prior to release then the statements made earlier are entirely true. The arrow will drop, because of gravity, immediately after leaving the bow. That is no different than what happens to a rifle bullet and it is travelling much faster than an arrow.

But if you put your twenty yard pin on a target then you are, in essence, raising the front of the arrow above the parallel of the ground...pointing the arrow above the point of aim. In this case the arrow does rise, in relation to the ground, before falling after the peak point of the arc of flight (actually a parabola but we don't need to get that technical).

Hope I explained that clearly enough. I knew what I was trying to communicate but don't know if I necessarily conveyed it to you.