caveat: i am green on this subject so i ask you to wait for others to support or deny my notions below.
this was an interesting enough topic that i felt compelled to contribute in an anecdotal way.
often using extremes in the case of variables helps one understand what roll the variable may have in the big picture. having said that, i can understand that an object spinning into another has the propensity to ride up it; pushes the other object down and it goes up from this "collision". friction and what i will call inertia (might not be correct) seem to contribute the most to how an object spinning will react within its environment. air being less dense(low friction?) than the mediums i conjure up in my mind i understand these effects will be much less vivid but none the less apparent especially when taken to an extreme; e.g. the 1000 yards in this discussion.
i can also see how an object contacting a spinning object the way it spins would tend push it down.
if i had to take a scientific guess i would extrapolate that the air contacting the spinning bullets caused localized areas of high pressure in the lower quadrants vs. the upper yielding a kind of buffer to the effects of gravity.
i made a crude drawing to possible explain what i think maybe happening.
i look forward to more input on this matter.