The shock that the three goblins had was enough to make them realize that they had just watched their tamer and fellow fighter be crushed. For a goblin, the strength of their group was major. That was why the strongest goblins often created villages or their own camps. That Was how they gathered. Clark had seen this before.
Therefore, it was clear that the rock goblins here would be in a long term fight with their own tamer to make themselves the top strength. It would be hard for the tamer to get past this without a lot of growth. Not to mention the wound on the shoulder caused by the midnight eel.
