@toly and @SystemicAnomaly - I think you are--both-- right, in a sense.
a) it is certainly possible to hit a twist (or a kick) serve that initially raises. This happens when the contact point, at least initially, is below the ball equator.
b) it is also possible to hit a twist (or a kick) serve that does not raise at all, but from the very beginning goes a bit downward. This happens when the contact point is above the ball equator.
for most of rec players it is certainly easier to do a). Pros can do b) as they can hit the ball so hard, and while jumping, that it will go over the net even though the trajectory is downward from the beginning.
What is not possible is to hit the ball above the equator (like from 10 to 2) and expect the ball to raise.