First few attempts at soloing this tortoise went pear shaped, the push is irritating enough but the mana drain on me and merc was the real shopstopper.
Came back much later and tried again. I got pushed and wedged against the steps to Sep West. However, there I could nuke without push interruptions. Maybe more by luck than judgement, bonus was that I was out of range of the mana drain. Merc got drained again but I was able to keep pet alive, which wasn't too hard since the DPS from tortoise wasn't that great.
105 SMolo Mage