I got it, too. Apparently, you missed my earlier post in response to you about negative Z. Or, maybe I was too obscure in my reference.
In the Star Trek movie "The Wrath of Khan", they end up chasing each other around in a nebula, which renders their navigational instruments (among other things) essentially useless. Spock suggests to Kirk that while Khan is undoubtedly very intelligent, his lack of experience in their current situation seems to indicate an inability (or lack of consideration) to think in three dimensions. Kirk gets the hint, and rather than chase Khan, he orders the helm to change their Z axis, which drops them below Khan's path. We're to understand that Khan is moving around in X, Y space and ignoring Z, so he passes right over the Enterprise. Kirk pops back up, now behind Khan, and blows his shitee away.
It's an old trick, really. Aerial dogfighters have been doing it since forever, but Hollywood keeps dragging it out as some sort of "deus ex machina" magic that probably works on much of the audience.