OweO the mechanics are something similar for the Deathsingers with 1 or 2 important changes, overall though a piece of cake. I didn't actually see your Ogre because of the plate I was on but Corey mentioned it to me yesterday he said it was teleporting forward, nasty =(
Yeah on that rotation it didn't appear and then was suddenly near the walkway. Then (on my screen at least) it started moving left and right (like PVP lag) and was a nightmare to hit.
I think AStaley had something similar with his "skating" Ogre.