A question about Haukke Manor Hard - Maybe a bug?

[Wanzzo]

Hi

In this Moogle Tomestones event happening this year me and some friends decided to do Haukke Manor Hard to farm some tomes.

The thing is:

In a lot of times, at the last boss the boss mechanic seems to be buggy.

I'll explain the mechanics of the last boss:
- each ad appearing along the fight wont die. Instead, their hp will be reduced to 01% after we hit them enough;
- the boss then, cast a spell to bring the ad close to her and then she absorbs the ads hp gaining a boost to a AoE that she casts pretty much right after absorbing the hp of the ad.
- the more hp on the ad at the moment she cast the spell, the more damage the boss will make in her AoE.

This goes pretty neat after 3 of the 4 ads. The problem is the last ad.

Sometimes, as the last ad spawns, we don't have time to hit the ad before boss pull it and absorb it leading to a wipe as she casts the AoE with the boost of damage. in one occasion, after only 10 secs after the last ad spawn, the boss absorbed her hp... '-'

We decided to use Limit Breaker on the last ad, but the ad's hp drops to something around 50% only and the last half we have to drop by hitting.

My question is: is it intended to be like this? is this a bug on the last ad? Is there anything that we missed in the fight mechanics capable of explain why this happened so often yesterday?

Thanks for any answer