Ways Pharos Sirius can go bad:

* Heal can fail to top people up after Siren puts her to-be-charmed debuff on.
* Heal can fail to keep up after group-wide Vulnerability Up goes on.
* Heal can fail to move away from crawling adds.
* DPS can fail to pick up adds.
* All can misread Siren's position when she flies off, resulting in needless damage.
* All can miss Siren going to mid (insta-charm for non-mid players).
* All can be insufficiently geared, due to low threshold for entry.