The little needle was one of its attacking methods and wasn't that easily destroyed. Actually, it could be said that it was impossible to destroy it. Otherwise, this Boss would be too easy.
Furthermore, it wasn't fighting alone – there were still two more Crypt Guardians.
The Crypt Guardians looked quite similar to their Boss, but with slightly smaller heads. Lu Li gave Wandering the responsibility of holding the Crypt Guardians' aggro and assigned a group of healers to heal him.
Looking over at the Boss, Azure Sea Breeze was already tanking its' heavy strikes. Anub'Rekhan had a pair of lethal and razor sharp claws. However, the damage dealt by them was rather average. Azure Sea Breeze only lost around 1000 HP with every hit. This meant that this Boss was likely to have many skills in its arsenal.
In the beginning, everyone was still deciding whether or not they should kill the Boss' minions.