Garuda (normal) bugged?

[HoroBoro]

It's the average health between all the pillars. In the times I've tried this, it doesn't matter which pillar you stand under and how big it is. If you have only 1 pillar, you're going to have a bad time.

Edit for comment below:

Your DPS should not let a single pillar fall. When I did it the first time, there were 4 pillars still up. However, 1 pillar was at critical (i.e. 1 rock). We took a lot of damage. I remember our healer died.

Next time, and every time after that, we killed all mobs and our pillars never fell to lower than 2 rocks. We sometimes even had 50% health after her 3rd phase ulti.