Ok so there is a huge flaw in the design of this map. Whichever team gets the immortal to half health, makes the immortal change positions and go invulnerable. Well the 2nd time, after one of them has gotten to half hp, you can burst the boss for its FULL hp without it ever changing again at half hp. So basically, there is no point in ever trying to kill the other team's Immortal first, since you can just defend yours and go for picks, get a pick and let them kill your immortal, then either wipe their team or just burst the boss in 1 swipe since they have a man down. I really think if you take out half the hp of your enemy's immortal, it should still do the stance switch if the team were to get yours to half hp after the first phase change. I hope this makes sense...