No.
You don't have to counteract every part of a monster.
Say you fight a bear in real life: you don't need to cut its arms off before piercing its heart or head.
So, same thing here.
You want to destroy their core, but its protected by a thick layer of skin.
(plus its hidden, not in plain view)
But you cannot start tearing it down with arrows, because of the eyes ability. It will dodge.
So first, you have to gouge its eyes out, or remain on close contact.
Once there, you can spend a few turn hacking at its skin, to get to a vital part later.
Or you can maim its claws or beak, so you are not constantly being attack.
But you don't have to, you can focus on the protective skin, and then just kill it by poking its heart.
A black bar tells that each section next to it is protected by the one above the bar.
Is it more clear ?