When Rabibi died because of Didi's sudden attack, the goblins quickly attacked the herd of hyenas so that they wouldn't be able to regroup.
Of course, it's not like the herd of hyenas were weak enough to be beaten by just a group of normal goblins.
The normal goblins of Dawn were insanely strong, but it's not like that means that their strength just went through the roof.
They still had their own limits, and that was why they weren't able to kill the hyenas all at the same time.
What's more, the hyenas were large. They were very big, and it would be tough work just to try and kill them.
That was why the normal goblins and the herd of hyenas were still fighting against each other.
Of course, the strongly blessed goblins were there to intervene every time a normal goblin was in danger.
If a goblin were about to be bitten by a hyena, Una would stop it and kill that hyena.