if you kill both shoulders then in my understanding the hands shouldn't attack. killing the abdomen removes the attack when he sucks air with some pink-ish attack and then your character walks to his death. ( cant explain it better ) its up to you which you prefer to dodge.
when i do normal gollux with my dark knight mule, i prefer the hand over the sucky thing attack.
As a fire / poison mage i hope that my skills would be less flashy... sometimes i turn off most of my supportive skills in bosses so i could even see something. Luckily i heard there's gonna be option in future to turn your skills invisible.
