hi blizz add a new way/event to we can kill https://www.wowhead.com/npc=9502/phalanx att only have the old method in the boss header

is easy in 2 steps

1- kill https://www.wowhead.com/npc=9499
2- the new mini event/trigger start and phalanx and all alive npcs turn hostile

screenshots of the new event:

angry drunk dwarf despawn

boss hostile