Trust me, the UG itself confuses me, you're not alone. To put it into better perspective: The UG is TYPICALLY for dead people.

On THAT note, I plant the Yvetal Signal on top of my hill and light it up. Yvetal comes to abduct MichaelXD (as was his pastime previously), but sees nobody and thinks that, as you're right next to the Y-Signal, you're responsible for the prank. He Oblivion Wing's you out of the atmosphere and gives chase, while I get rid of the Y-Signal quickly (no longer needing it) and reclaim my hill.

MY HILL!!!